essay on enlightenment thinkers

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Enlightenment

By: History.com Editors

Updated: February 21, 2020 | Original: December 16, 2009

European politics, philosophy, science and communications were radically reoriented during the course of the “long 18th century” (1685-1815) as part of a movement referred to by its participants as the Age of Reason, or simply the Enlightenment. Enlightenment thinkers in Britain, in France and throughout Europe questioned traditional authority and embraced the notion that humanity could be improved through rational change. 

The Enlightenment produced numerous books, essays, inventions, scientific discoveries, laws, wars and revolutions. The American and French Revolutions were directly inspired by Enlightenment ideals and respectively marked the peak of its influence and the beginning of its decline. The Enlightenment ultimately gave way to 19th-century Romanticism.

The Early Enlightenment: 1685-1730

The Enlightenment’s important 17th-century precursors included the Englishmen Francis Bacon and Thomas Hobbes, the Frenchman René Descartes and the key natural philosophers of the Scientific Revolution, including Galileo Galilei, Johannes Kepler and Gottfried Wilhelm Leibniz. Its roots are usually traced to 1680s England, where in the span of three years Isaac Newton published his “Principia Mathematica” (1686) and John Locke his “Essay Concerning Human Understanding” (1689)—two works that provided the scientific, mathematical and philosophical toolkit for the Enlightenment’s major advances.

Did you know? In his essay 'What Is Enlightenment?' (1784), the German philosopher Immanuel Kant summed up the era's motto in the following terms: 'Dare to know! Have courage to use your own reason!'

Locke argued that human nature was mutable and that knowledge was gained through accumulated experience rather than by accessing some sort of outside truth. Newton’s calculus and optical theories provided the powerful Enlightenment metaphors for precisely measured change and illumination.

There was no single, unified Enlightenment. Instead, it is possible to speak of the French Enlightenment, the Scottish Enlightenment and the English, German, Swiss or American Enlightenment. Individual Enlightenment thinkers often had very different approaches. Locke differed from David Hume, Jean-Jacques Rousseau from Voltaire , Thomas Jefferson from Frederick the Great . Their differences and disagreements, though, emerged out of the common Enlightenment themes of rational questioning and belief in progress through dialogue.

The High Enlightenment: 1730-1780

Centered on the dialogues and publications of the French “philosophes” (Voltaire, Rousseau, Montesquieu, Buffon and Denis Diderot), the High Enlightenment might best be summed up by one historian’s summary of Voltaire’s “Philosophical Dictionary”: “a chaos of clear ideas.” Foremost among these was the notion that everything in the universe could be rationally demystified and cataloged. The signature publication of the period was Diderot’s “Encyclopédie” (1751-77), which brought together leading authors to produce an ambitious compilation of human knowledge.

It was an age of enlightened despots like Frederick the Great, who unified, rationalized and modernized Prussia in between brutal multi-year wars with Austria, and of enlightened would-be revolutionaries like Thomas Paine and Thomas Jefferson, whose “Declaration of Independence” (1776) framed the American Revolution in terms taken from of Locke’s essays.

It was also a time of religious (and anti-religious) innovation, as Christians sought to reposition their faith along rational lines and deists and materialists argued that the universe seemed to determine its own course without God’s intervention. Locke, along with French philosopher Pierre Bayle, began to champion the idea of the separation of Church and State. Secret societies—like the Freemasons, the Bavarian Illuminati and the Rosicrucians—flourished, offering European men (and a few women) new modes of fellowship, esoteric ritual and mutual assistance. Coffeehouses, newspapers and literary salons emerged as new venues for ideas to circulate.

The Late Enlightenment and Beyond: 1780-1815

The French Revolution of 1789 was the culmination of the High Enlightenment vision of throwing out the old authorities to remake society along rational lines, but it devolved into bloody terror that showed the limits of its own ideas and led, a decade later, to the rise of Napoleon . Still, its goal of egalitarianism attracted the admiration of the early feminist Mary Wollstonecraft (mother of “Frankenstein” author Mary Shelley) and inspired both the Haitian war of independence and the radical racial inclusivism of Paraguay’s first post-independence government.

Enlightened rationality gave way to the wildness of Romanticism, but 19th-century Liberalism and Classicism—not to mention 20th-century Modernism —all owe a heavy debt to the thinkers of the Enlightenment.

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18 Key Thinkers of the Enlightenment

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At the most visible end of the Enlightenment were a group of thinkers who consciously sought human advancement through logic, reason, and criticism. Biographical sketches of these key figures are below in alphabetical order of their surnames.

Alembert, Jean Le Rond d’ 1717 – 1783

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The illegitimate son of hostess Mme de Tencin, Alembert was named after the church on whose steps he was abandoned. His supposed father paid for an education and Alembert became famous both as a mathematician and as co-editor of the Encyclopédie , for which he authored over a thousand articles. Criticism of this—he was accused of being too anti-religious—saw him resign and devote his time to other works, including literature. He turned down employment from both Frederick II of Prussia and Catherine II of Russia .

Beccaria, Cesare 1738 - 1794

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The Italian author of On Crimes and Punishments , published in 1764, Beccaria argued for punishment to be secular, rather than based on religious judgments of sin, and for legal reforms including the end of capital punishment and judicial torture. His works proved to be hugely influential among European thinkers, not just those of the Enlightenment.

Buffon, Georges-Louis Leclerc 1707 – 1788

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The son of a highly ranked legal family, Buffon changed from legal education to science and contributed to the Enlightenment with works on natural history, in which he rejected the biblical chronology of the past in ​favor of the Earth being older and flirted with the idea that species could change. His Histoire Naturelle aimed to classify the whole natural world, including humans.

Condorcet, Jean-Antoine-Nicolas Caritat 1743 – 1794

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One of the leading thinkers of the late Enlightenment, Condorcet focused largely on science and mathematics, producing important works on probability and writing for the Encyclopédie . He worked in the French government and became a deputy of the Convention in 1792, where he promoted education and freedom for enslaved people, but died during the Terror . Work on his belief in human progress was published posthumously.

Diderot, Denis 1713 – 1784

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Originally the son of artisans, Diderot first entered the church before leaving and working as a law clerk. He achieved fame in the Enlightenment era chiefly for editing arguably the key text, his Encyclopédie , which took up over 20 years of his life. However, he wrote widely on science, philosophy, and the arts, as well as plays and fiction, but left many of his works unpublished, partly a result of being imprisoned for his early writings. Consequently, Diderot only gained his reputation as one of the titans of the Enlightenment after his death, when his work was published.

Gibbon, Edward 1737 – 1794

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Gibbon is the author of the most famous work of history in the English language, The History of the Decline and Fall of the Roman Empire . It has been described as a work of “humane skepticism,” and marked Gibbon out as the greatest of the Enlightenment historians. He was also a member of the British parliament.

Herder, Johann Gottfried von 1744 – 1803

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Herder studied at Königsburg under Kant and also met Diderot and d’Alembert in Paris. Ordained in 1767, Herder met Goethe , who obtained for him the position of a court preacher. Herder wrote on German literature, arguing for its independence, and his literary criticism became a heavy influence on later Romantic thinkers.

Holbach, Paul-Henri Thiry 1723 – 1789

A successful financier, Holbach’s salon became a meeting place for Enlightenment figures like Diderot, d’Alembert, and Rousseau. He wrote for the Encyclopédie , while his personal writings attacked organized religion, finding their most famous expression in the co-written Systéme de la Nature , which brought him into conflict with Voltaire.

Hume, David 1711 – 1776

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Building his career after a nervous breakdown, Hume gained attention for his History of England and established a name for himself among Enlightenment thinkers while working at the British embassy in Paris. His ​best-known work is the full three volumes of the Treatise of Human Nature but, despite being friends with people like Diderot, the work was largely ignored by his contemporaries and only gained a posthumous reputation.

Kant, Immanuel 1724 – 1804

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A Prussian who studied at the University of Königsburg, Kant became a professor of mathematics and philosophy and later rector there. The Critique of Pure Reason , arguably his most famous work, is just one of several key Enlightenment texts which also include his era-defining essay What is Enlightenment?

Locke, John 1632 – 1704

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A key thinker of the early Enlightenment, the English Locke was educated at Oxford but read wider than his course, gaining a degree in medicine before pursuing a varied career. His Essay Concerning Human Understanding of 1690 challenged Descartes’ views and influenced later thinkers, and he helped pioneer views on toleration and produced views on government which would underpin later thinkers. Locke was forced to flee England for Holland in 1683 because of his links to plots against the king, before returning after William and Mary took the throne.

Montesquieu, Charles-Louis Secondat 1689 – 1755

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Born into a prominent legal family, Montesquieu was a lawyer and president of the Bordeaux Parlement. He first came to the attention of the Parisian literary world with his satire Persian Letters , which tackled French institutions and the “Orient,” but is best known for Esprit des Lois , or The Spirit of the Laws . Published in 1748, this was an examination of different forms of government which became one of the most widely disseminated works of the Enlightenment, especially after the church added it to their banned list in 1751.

Newton, Isaac 1642 – 1727

Although involved in alchemy and theology, it is Newton’s scientific and mathematical achievements for which he is chiefly recognized. The methodology and ideas he outlined in key works like the Principia helped forge a new model for “natural philosophy” which the thinkers of the Enlightenment tried to apply to humanity and society.

Quesnay, François 1694 – 1774

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A surgeon who eventually ended up working for the French king, Quesnay contributed articles for the ​ Encyclopédie and hosted meetings at his chambers among Diderot and others. His economic works were influential, developing a theory called Physiocracy, which held that land was the source of wealth, a situation requiring a strong monarchy to secure a free market.

Raynal, Guillaume-Thomas 1713 - 1796

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Originally a priest and personal tutor, Raynal emerged onto the intellectual scene when he published Anecdotes Littéaires in 1750. He came into contact with Diderot and wrote his most famous work, Histoire des deux Indes ( History of the East and West Indies ), a history of the colonialism of European nations. It has been called a “mouthpiece” of Enlightenment ideas and thought, although the most groundbreaking passages were written by Diderot. It proved so popular across Europe that Raynal left Paris to avoid the publicity, later being temporarily exiled from France.

Rousseau, Jean-Jacques 1712 – 1778

Born in Geneva, Rousseau spent the early years of his adult life traveling in poverty, before educating himself and traveling to Paris. Increasingly turning from music to writing, Rousseau formed an association with Diderot and wrote for the ​​ Encyclopédie , before winning a prestigious award which pushed him firmly onto the Enlightenment scene. However, he fell out with Diderot and Voltaire and turned away from them in later works. On one occasion Rousseau managed to alienate the major religions, forcing him to flee France. His Du Contrat Social became a major influence during the French Revolution, and he has been called a major influence on Romanticism.

Turgot, Anne-Robert-Jacques 1727 – 1781

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Turgot was something of a rarity among leading figures in the Enlightenment, for he held high office in​ the French government. After beginning his career in the Paris Parlement, he became Intendant of Limoges, Navy Minister, and Finance Minister. He contributed articles to the Encyclopédie , chiefly on economics, and wrote further works on the subject, but found his position in government weakened by a commitment to free trade in wheat which led to high prices and riots.

Voltaire, François-Marie Arouet 1694 – 1778

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Voltaire is one of, if not the, most dominant Enlightenment figures, and his death is sometimes cited as the end of the period. The son of a lawyer and educated by Jesuits, Voltaire wrote widely and frequently on many subjects for a long time period, also maintaining correspondence. He was imprisoned early in his career for his satires and spend time exiled in England before a brief period as court historiographer to the French king. After this, he continued to travel, finally settling on the Swiss border. He is perhaps best known today for his satire Candide .

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Enlightenment

The heart of the eighteenth century Enlightenment is the loosely organized activity of prominent French thinkers of the mid-decades of the eighteenth century, the so-called “ philosophes ”(e.g., Voltaire, D’Alembert, Diderot, Montesquieu). The philosophes constituted an informal society of men of letters who collaborated on a loosely defined project of Enlightenment exemplified by the project of the Encyclopedia (see below 1.5). However, there are noteworthy centers of Enlightenment outside of France as well. There is a renowned Scottish Enlightenment (key figures are Frances Hutcheson, Adam Smith, David Hume, Thomas Reid), a German Enlightenment ( die Aufklärung , key figures of which include Christian Wolff, Moses Mendelssohn, G.E. Lessing and Immanuel Kant), and there are also other hubs of Enlightenment and Enlightenment thinkers scattered throughout Europe and America in the eighteenth century.

What makes for the unity of such tremendously diverse thinkers under the label of “Enlightenment”? For the purposes of this entry, the Enlightenment is conceived broadly. D’Alembert, a leading figure of the French Enlightenment, characterizes his eighteenth century, in the midst of it, as “the century of philosophy par excellence ”, because of the tremendous intellectual and scientific progress of the age, but also because of the expectation of the age that philosophy (in the broad sense of the time, which includes the natural and social sciences) would dramatically improve human life. Guided by D’Alembert’s characterization of his century, the Enlightenment is conceived here as having its primary origin in the scientific revolution of the 16th and 17th centuries. The rise of the new science progressively undermines not only the ancient geocentric conception of the cosmos, but also the set of presuppositions that had served to constrain and guide philosophical inquiry in the earlier times. The dramatic success of the new science in explaining the natural world promotes philosophy from a handmaiden of theology, constrained by its purposes and methods, to an independent force with the power and authority to challenge the old and construct the new, in the realms both of theory and practice, on the basis of its own principles. Taking as the core of the Enlightenment the aspiration for intellectual progress, and the belief in the power of such progress to improve human society and individual lives, this entry includes descriptions of relevant aspects of the thought of earlier thinkers, such as Hobbes, Locke, Descartes, Bayle, Leibniz, and Spinoza, thinkers whose contributions are indispensable to understanding the eighteenth century as “the century of philosophy par excellence ”.

The Enlightenment is often associated with its political revolutions and ideals, especially the French Revolution of 1789. The energy created and expressed by the intellectual foment of Enlightenment thinkers contributes to the growing wave of social unrest in France in the eighteenth century. The social unrest comes to a head in the violent political upheaval which sweeps away the traditionally and hierarchically structured ancien régime (the monarchy, the privileges of the nobility, the political power of the Catholic Church). The French revolutionaries meant to establish in place of the ancien régime a new reason-based order instituting the Enlightenment ideals of liberty and equality. Though the Enlightenment, as a diverse intellectual and social movement, has no definite end, the devolution of the French Revolution into the Terror in the 1790s, corresponding, as it roughly does, with the end of the eighteenth century and the rise of opposed movements, such as Romanticism, can serve as a convenient marker of the end of the Enlightenment, conceived as an historical period.

For Enlightenment thinkers themselves, however, the Enlightenment is not an historical period, but a process of social, psychological or spiritual development, unbound to time or place. Immanuel Kant defines “enlightenment” in his famous contribution to debate on the question in an essay entitled “An Answer to the Question: What is Enlightenment?” (1784), as humankind’s release from its self-incurred immaturity; “immaturity is the inability to use one’s own understanding without the guidance of another.” Expressing convictions shared among Enlightenment thinkers of widely divergent doctrines, Kant identifies enlightenment with the process of undertaking to think for oneself, to employ and rely on one’s own intellectual capacities in determining what to believe and how to act. Enlightenment philosophers from across the geographical and temporal spectrum tend to have a great deal of confidence in humanity’s intellectual powers, both to achieve systematic knowledge of nature and to serve as an authoritative guide in practical life. This confidence is generally paired with suspicion or hostility toward other forms or carriers of authority (such as tradition, superstition, prejudice, myth and miracles), insofar as these are seen to compete with the authority of one’s own reason and experience. Enlightenment philosophy tends to stand in tension with established religion, insofar as the release from self-incurred immaturity in this age, daring to think for oneself, awakening one’s intellectual powers, generally requires opposing the role of established religion in directing thought and action. The faith of the Enlightenment – if one may call it that – is that the process of enlightenment, of becoming progressively self-directed in thought and action through the awakening of one’s intellectual powers, leads ultimately to a better, more fulfilled human existence.

This entry describes the main tendencies of Enlightenment thought in the following main sections: (1) The True: Science, Epistemology, and Metaphysics in the Enlightenment; (2) The Good: Political Theory, Ethical Theory and Religion in the Enlightenment; (3) The Beautiful: Aesthetics in the Enlightenment.

1.1 Rationalism and the Enlightenment

1.2 empiricism and the enlightenment, 1.3 skepticism in the enlightenment, 1.4 science of man and subjectivism in the enlightenment, 1.5 emerging sciences and the encyclopedia, 2.1 political theory, 2.2 ethical theory, 2.3 religion and the enlightenment, 3.1 french classicism and german rationalism, 3.2 empiricism and subjectivism, 3.3 late enlightenment aesthetics, other internet resources, related entries, 1. the true: science, epistemology and metaphysics in the enlightenment.

In this era dedicated to human progress, the advancement of the natural sciences is regarded as the main exemplification of, and fuel for, such progress. Isaac Newton’s epochal accomplishment in his Principia Mathematica (1687), which, very briefly described, consists in the comprehension of a diversity of physical phenomena – in particular the motions of heavenly bodies, together with the motions of sublunary bodies – in few relatively simple, universally applicable, mathematical laws, was a great stimulus to the intellectual activity of the eighteenth century and served as a model and inspiration for the researches of a number of Enlightenment thinkers. Newton’s system strongly encourages the Enlightenment conception of nature as an orderly domain governed by strict mathematical-dynamical laws and the conception of ourselves as capable of knowing those laws and of plumbing the secrets of nature through the exercise of our unaided faculties. – The conception of nature, and of how we know it, changes significantly with the rise of modern science. It belongs centrally to the agenda of Enlightenment philosophy to contribute to the new knowledge of nature, and to provide a metaphysical framework within which to place and interpret this new knowledge.

René Descartes’ rationalist system of philosophy is one of the pillars on which Enlightenment thought rests. Descartes (1596–1650) undertakes to establish the sciences upon a secure metaphysical foundation. The famous method of doubt Descartes employs for this purpose exemplifies (in part through exaggerating) an attitude characteristic of the Enlightenment. According to Descartes, the investigator in foundational philosophical research ought to doubt all propositions that can be doubted. The investigator determines whether a proposition is dubitable by attempting to construct a possible scenario under which it is false. In the domain of fundamental scientific (philosophical) research, no other authority but one’s own conviction is to be trusted, and not one’s own conviction either, until it is subjected to rigorous skeptical questioning. With his method, Descartes casts doubt upon the senses as authoritative source of knowledge. He finds that God and the immaterial soul are both better known, on the basis of innate ideas, than objects of the senses. Through his famous doctrine of the dualism of mind and body, that mind and body are two distinct substances, each with its own essence, the material world (allegedly) known through the senses becomes denominated as an “external” world, insofar as it is external to the ideas with which one immediately communes in one’s consciousness. Descartes’ investigation thus establishes one of the central epistemological problems, not only of the Enlightenment, but also of modernity: the problem of objectivity in our empirical knowledge. If our evidence for the truth of propositions about extra-mental material reality is always restricted to mental content, content before the mind, how can we ever be certain that the extra-mental reality is not other than we represent it as being? Descartes’ solution depends on our having secured prior and certain knowledge of God. In fact, Descartes argues that all human knowledge (not only knowledge of the material world through the senses) depends on metaphysical knowledge of God.

Despite Descartes’ grounding of all scientific knowledge in metaphysical knowledge of God, his system contributes significantly to the advance of natural science in the period. He attacks the long-standing assumptions of the scholastic-aristotelians whose intellectual dominance stood in the way of the development of the new science; he developed a conception of matter that enabled mechanical explanation of physical phenomena; and he developed some of the fundamental mathematical resources – in particular, a way to employ algebraic equations to solve geometrical problems – that enabled the physical domain to be explained with precise, simple mathematical formulae. Furthermore, his grounding of physics, and all knowledge, in a relatively simple and elegant rationalist metaphysics provides a model of a rigorous and complete secular system of knowledge. Though major Enlightenment thinkers (for example Voltaire in his Letters on the English Nation , 1734) embrace Newton’s physical system in preference to Descartes’, Newton’s system itself depends on Descartes’ earlier work, a dependence to which Newton himself attests.

Cartesian philosophy also ignites various controversies in the latter decades of the seventeenth century that provide the context of intellectual tumult out of which the Enlightenment springs. Among these controversies are the following: Are mind and body really two distinct sorts of substances, and if so, what is the nature of each, and how are they related to each other, both in the human being (which presumably “has” both a mind and a body) and in a unified world system? If matter is inert (as Descartes claims), what can be the source of motion and the nature of causality in the physical world? And of course the various epistemological problems: the problem of objectivity, the role of God in securing our knowledge, the doctrine of innate ideas, and others.

Baruch Spinoza’s systematic rationalist metaphysics, which he develops in his Ethics (1677) in part in response to problems in the Cartesian system, is also an important basis for Enlightenment thought. Spinoza develops, in contrast to Cartesian dualism, an ontological monism according to which there is only one substance, God or nature, with two attributes, corresponding to mind and body. Spinoza’s denial, on the basis of strict philosophical reasoning, of the existence of a transcendent supreme being, his identification of God with nature, gives strong impetus to the strands of atheism and naturalism that thread through Enlightenment philosophy. Spinoza’s rationalist principles also lead him to assert a strict determinism and to deny any role to final causes or teleology in explanation. (See Israel 2001.)

The rationalist metaphysics of Leibniz (1646–1716) is also foundational for the Enlightenment, particularly the German Enlightenment ( die Aufklärung ), one prominent expression of which is the Leibnizian rationalist system of Christian Wolff (1679–1754). Leibniz articulates, and places at the head of metaphysics, the great rationalist principle, the principle of sufficient reason, which states that everything that exists has a sufficient reason for its existence. This principle exemplifies the characteristic conviction of the Enlightenment that the universe is thoroughly rationally intelligible. The question arises of how this principle itself can be known or grounded. Wolff attempts to derive it from the logical principle of non-contradiction (in his First Philosophy or Ontology , 1730). Criticism of this alleged derivation gives rise to the general question of how formal principles of logic can possibly serve to ground substantive knowledge of reality. Whereas Leibniz exerts his influence through scattered writings on various topics, some of which elaborate plans for a systematic metaphysics which are never executed by Leibniz himself, Wolff exerts his influence on the German Enlightenment through his development of a rationalist system of knowledge in which he attempts to demonstrate all the propositions of science from first principles, known a priori.

Wolff’s rationalist metaphysics is characteristic of the Enlightenment by virtue of the pretensions of human reason within it, not by reason’s success in establishing its claims. Much the same could be said of the great rationalist philosophers of the seventeenth century. Through their articulation of the ideal of scientia, of a complete science of reality, composed of propositions derived demonstratively from a priori first principles, these philosophers exert great influence on the Enlightenment. But they fail, rather spectacularly, to realize this ideal. To the contrary, what they bequeath to the eighteenth century is metaphysics, in the words of Kant, as “a battlefield of endless controversies.” However, the controversies themselves – regarding the nature of God, mind, matter, substance, cause, et cetera, and the relations of each of these to the others – provide tremendous fuel to Enlightenment thought.

Despite the confidence in and enthusiasm for human reason in the Enlightenment – it is sometimes called “the Age of Reason” – the rise of empiricism, both in the practice of science and in the theory of knowledge, is characteristic of the period. The enthusiasm for reason in the Enlightenment is primarily not for the faculty of reason as an independent source of knowledge, which is embattled in the period, but rather for the human cognitive faculties generally; the Age of Reason contrasts with an age of religious faith, not with an age of sense experience. Though the great seventeenth century rationalist metaphysical systems of Descartes, Spinoza and Leibniz exert tremendous influence on philosophy in the Enlightenment; moreover, and though the eighteenth-century Enlightenment has a rationalist strain (perhaps best exemplified by the system of Christian Wolff), nevertheless, that the Encyclopedia of Diderot and D’Alembert is dedicated to three empiricists (Francis Bacon, John Locke and Isaac Newton), signals the ascendency of empiricism in the period.

If the founder of the rationalist strain of the Enlightenment is Descartes, then the founder of the empiricist strain is Francis Bacon (1561–1626). Though Bacon’s work belongs to the Renaissance, the revolution he undertook to effect in the sciences inspires and influences Enlightenment thinkers. The Enlightenment, as the age in which experimental natural science matures and comes into its own, admires Bacon as “the father of experimental philosophy.” Bacon’s revolution (enacted in, among other works, The New Organon , 1620) involves conceiving the new science as (1) founded on empirical observation and experimentation; (2) arrived at through the method of induction; and (3) as ultimately aiming at, and as confirmed by, enhanced practical capacities (hence the Baconian motto, “knowledge is power”).

Of these elements of Bacon’s revolution, the point about method deserves special emphasis. Isaac Newton’s work, which stands as the great exemplar of the accomplishments of natural science for the eighteenth century, is, like Bacon’s, based on the inductive method. Whereas rationalist of the seventeenth century tend to conceive of scientific knowledge of nature as consisting in a system in which statements expressing the observable phenomena of nature are deduced from first principles, known a priori, Newton’s method begins with the observed phenomena of nature and reduces its multiplicity to unity by induction, that is, by finding mathematical laws or principles from which the observed phenomena can be derived or explained. The evident success of Newton’s “bottom-up” procedure contrasts sharply with the seemingly endless and fruitless conflicts among philosophers regarding the meaning and validity of first principles of reason, and this contrast naturally favors the rise of the Newtonian (or Baconian) method of acquiring knowledge of nature in the eighteenth century.

The tendency of natural science toward progressive independence from metaphysics in the eighteenth century is correlated with this point about method. The rise of modern science in the sixteenth and seventeenth centuries proceeds through its separation from the presuppositions, doctrines and methodology of theology; natural science in the eighteenth century proceeds to separate itself from metaphysics as well. Newton proves the capacity of natural science to succeed independently of a priori, clear and certain first principles. The characteristic Enlightenment suspicion of all allegedly authoritative claims the validity of which is obscure, which is directed first of all against religious dogmas, extends to the claims of metaphysics as well. While there are significant Enlightenment thinkers who are metaphysicians – again, one thinks of Christian Wolff – the general thrust of Enlightenment thought is anti-metaphysical.

John Locke’s Essay Concerning Human Understanding (1690) is another foundational text of the Enlightenment. A main source of its influence is the epistemological rigor that it displays, which is at least implicitly anti-metaphysical. Locke undertakes in this work to examine the human understanding in order to determine the limits of human knowledge; he thereby institutes a prominent pattern of Enlightenment epistemology. Locke finds the source of all our ideas, the ideas out of which human knowledge is constructed, in the senses and argues influentially against the rationalists’ doctrine of innate ideas. Locke’s sensationalism exerts great influence in the French Enlightenment, primarily through being taken up and radicalized by the philosophe , Abbé de Condillac. In the Treatise on Sensations (1754), Condillac attempts to explain how all human knowledge arises out of sense experience. Locke’s epistemology, as developed by Condillac and others, contributes greatly to the emerging science of psychology in the period.

Locke and Descartes both pursue a method in epistemology that brings with it the epistemological problem of objectivity. Both examine our knowledge by way of examining the ideas we encounter directly in our consciousness. This method comes to be called “the way of ideas”. Though neither for Locke nor for Descartes do all of our ideas represent their objects by way of resembling them (e.g., our idea of God does not represent God by virtue of resembling God), our alleged knowledge of our environment through the senses does depend largely on ideas that allegedly resemble external material objects. The way of ideas implies the epistemological problem of how we can know that these ideas do in fact resemble their objects. How can we be sure that these objects do not appear one way before the mind and exist in another way (or not at all) in reality outside the mind? George Berkeley, an empiricist philosopher influenced by John Locke, avoids the problem by asserting the metaphysics of idealism: the (apparently material) objects of perception are nothing but ideas before the mind. However, Berkeley’s idealism is less influential in, and characteristic of, the Enlightenment, than the opposing positions of materialism and Cartesian dualism. Thomas Reid, a prominent member of the Scottish Enlightenment, attacks the way of ideas and argues that the immediate objects of our (sense) perception are the common (material) objects in our environment, not ideas in our mind. Reid mounts his defense of naïve realism as a defense of common sense over against the doctrines of the philosophers. The defense of common sense, and the related idea that the results of philosophy ought to be of use to common people, are characteristic ideas of the Enlightenment, particularly pronounced in the Scottish Enlightenment.

Skepticism enjoys a remarkably strong place in Enlightenment philosophy, given that confidence in our intellectual capacities to achieve systematic knowledge of nature is a leading characteristic of the age. This oddity is at least softened by the point that much skepticism in the Enlightenment is merely methodological, a tool meant to serve science, rather than a position embraced on its own account. The instrumental role for skepticism is exemplified prominently in Descartes’ Meditations on First Philosophy (1641), in which Descartes employs radical skeptical doubt to attack prejudices derived from learning and from sense experience and to search out principles known with certainty which may serve as a secure foundation for a new system of knowledge. Given the negative, critical, suspicious attitude of the Enlightenment towards doctrines traditionally regarded as well founded, it is not surprising that Enlightenment thinkers employ skeptical tropes (drawn from the ancient skeptical tradition) to attack traditional dogmas in science, metaphysics and religion.

However, skepticism is not merely a methodological tool in the hands of Enlightenment thinkers. The skeptical cast of mind is one prominent manifestation of the Enlightenment spirit. The influence of Pierre Bayle, another founding figure of the Enlightenment, testifies to this. Bayle was a French Protestant, who, like many European philosophers of his time, was forced to live and work in politically liberal and tolerant Holland in order to avoid censorship and prison. Bayle’s Historical and Critical Dictionary (1697), a strange and wonderful book, exerts great influence on the age. The form of the book is intimidating: a biographical dictionary, with long scholarly entries on obscure figures in the history of culture, interrupted by long scholarly footnotes, which are in turn interrupted by further footnotes. Rarely has a work with such intimidating scholarly pretentions exerted such radical and liberating influence in the culture. It exerts this influence through its skeptical questioning of religious, metaphysical, and scientific dogmas. Bayle’s eclecticism and his tendency to follow arguments without pre-arranging their conclusions make it difficult to categorize his thought. It is the attitude of inquiry that Bayle displays, rather than any doctrine he espouses, that mark his as distinctively Enlightenment thought. He is fearless and presumptuous in questioning all manner of dogma. His attitude of inquiry resembles both that of Descartes’ meditator and that of the person undergoing enlightenment as Kant defines it, the attitude of coming to think for oneself, of daring to know. This epistemological attitude, as manifest in distrust of authority and reliance on one’s own capacity to judge, expresses the Enlightenment values of individualism and self-determination.

This skeptical/critical attitude underlies a significant tension in the age. While it is common to conceive of the Enlightenment as supplanting the authority of tradition and religious dogma with the authority of reason, in fact the Enlightenment is characterized by a crisis of authority regarding any belief. This is perhaps best illustrated with reference to David Hume’s skepticism, as developed in Book One of A Treatise of Human Nature (1739–40) and in his later Enquiries Concerning Human Understanding (1748). While one might take Hume’s skepticism to imply that he is an outlier with respect to the Enlightenment, it is more convincing to see Hume’s skepticism as a flowering of a crisis regarding authority in belief that is internal to the Enlightenment. Hume articulates a variety of skepticisms. His “skepticism with regard to the senses” is structured by the epistemological problem bound up with the way of ideas, described above. Hume also articulates skepticism with regard to reason in an argument that is anticipated by Bayle. Hume begins this argument by noting that, though rules or principles in demonstrative sciences are certain or infallible, given the fallibility of our faculties, our applications of such rules or principles in demonstrative inferences yield conclusions that cannot be regarded as certain or infallible. On reflection, our conviction in the conclusions of demonstrative reasoning must be qualified by an assessment of the likelihood that we made a mistake in our reasoning. Thus, Hume writes, “all knowledge degenerates into probability” ( Treatise , I.iv.i). Hume argues further that, given this degeneration, for any judgment, our assessment of the likelihood that we made a mistake, and the corresponding diminution of certainty in the conclusion, is another judgment about which we ought make a further assessment, which leads to a further diminution of certainty in our original conclusion, leading “at last [to] a total extinction of belief and evidence”. Hume also famously questions the justification of inductive reasoning and causal reasoning. According to Hume’s argument, since in causal reasoning we take our past observations to serve as evidence for judgments regarding what will happen in relevantly similar circumstances in the future, causal reasoning depends on the assumption that the future course of nature will resemble the past; and there is no non-circular justification of this essential assumption. Hume concludes that we have no rational justification for our causal or inductive judgments. Hume’s skeptical arguments regarding causal reasoning are more radical than his skeptical questioning of reason as such, insofar as they call into question even experience itself as a ground for knowledge and implicitly challenge the credentials of Newtonian science itself, the very pride of the Enlightenment. The question implicitly raised by Hume’s powerful skeptical arguments is whether any epistemological authority at all can withstand critical scrutiny. The Enlightenment begins by unleashing skepticism in attacking limited, circumscribed targets, but once the skeptical genie is out of the bottle, it becomes difficult to maintain conviction in any authority. Thus, the despairing attitude that Hume famously expresses in the conclusion to Book One of the Treatise , as the consequence of his epistemological inquiry, while it clashes with the self-confident and optimistic attitude we associate with the Enlightenment, in fact reflects an essential possibility in a distinctive Enlightenment problematic regarding authority in belief.

Though Hume finds himself struggling with skepticism in the conclusion of Book One of the Treatise , the project of the work as he outlines it is not to advance a skeptical viewpoint, but to establish a science of the mind. Hume is one of many Enlightenment thinkers who aspire to be the “Newton of the mind”; he aspires to establish the basic laws that govern the elements of the human mind in its operations. Alexander Pope’s famous couplet in An Essay on Man (1733) (“Know then thyself, presume not God to scan/ The proper study of mankind is man”) expresses well the intense interest humanity gains in itself within the context of the Enlightenment, as a partial substitute for its traditional interest in God and the transcendent domain. Just as the sun replaces the earth as the center of our cosmos in Copernicus’ cosmological system, so humanity itself replaces God at the center of humanity’s consciousness in the Enlightenment. Given the Enlightenment’s passion for science, the self-directed attention naturally takes the form of the rise of the scientific study of humanity in the period.

The enthusiasm for the scientific study of humanity in the period incorporates a tension or paradox concerning the place of humanity in the cosmos, as the cosmos is re-conceived in the context of Enlightenment philosophy and science. Newton’s success early in the Enlightenment of subsuming the phenomena of nature under universal laws of motion, expressed in simple mathematical formulae, encourages the conception of nature as a very complicated machine, whose parts are material and whose motions and properties are fully accounted for by deterministic causal laws. But if our conception of nature is of an exclusively material domain governed by deterministic, mechanical laws, and if we at the same time deny the place of the supernatural in the cosmos, then how does humanity itself fit into the cosmos? On the one hand, the achievements of the natural sciences in general are the great pride of the Enlightenment, manifesting the excellence of distinctively human capacities. The pride and self-assertiveness of humanity in the Enlightenment expresses itself, among other ways, in humanity’s making the study of itself its central concern. On the other hand, the study of humanity in the Enlightenment typically yields a portrait of us that is the opposite of flattering or elevating. Instead of being represented as occupying a privileged place in nature, as made in the image of God, humanity is represented typically in the Enlightenment as a fully natural creature, devoid of free will, of an immortal soul, and of a non-natural faculty of intelligence or reason. The very title of J.O. de La Mettrie’s Man a Machine (1748), for example, seems designed to deflate humanity’s self-conception, and in this respect it is characteristic of the Enlightenment “science of man”. It is true of a number of works of the Enlightenment, perhaps especially works in the more radical French Enlightenment – notable here are Helvétius’s Of the Spirit (1758) and Baron d’Holbach’s System of Nature (1770) – that they at once express the remarkable self-assertiveness of humanity characteristic of the Enlightenment in their scientific aspirations while at the same time painting a portrait of humanity that dramatically deflates its traditional self-image as occupying a privileged position in nature.

The methodology of epistemology in the period reflects a similar tension. Given the epistemological role of Descartes’ famous “ cogito, ergo sum ” in his system of knowledge, one might see Descartes’ epistemology as already marking the transition from an epistemology privileging knowledge of God to one that privileges self-knowledge instead. However, in Descartes’ epistemology, it remains true that knowledge of God serves as the necessary foundation for all human knowledge. Hume’s Treatise displays such a re-orientation less ambiguously. As noted, Hume means his work to comprise a science of the mind or of man. In the Introduction, Hume describes the science of man as effectively a foundation for all the sciences since all sciences “lie under the cognizance of men, and are judged of by their powers and faculties.” In other words, since all science is human knowledge, scientific knowledge of humanity is the foundation of the sciences. Hume’s placing the science of man at the foundation of all the sciences both exemplifies the privilege afforded to “mankind’s study of man” within the Enlightenment and provides an interpretation of it. But Hume’s methodological privileging of humanity in the system of sciences contrasts sharply with what he says in the body of his science about humanity. In Hume’s science of man, reason as a faculty of knowledge is skeptically attacked and marginalized; reason is attributed to other animals as well; belief is shown to be grounded in custom and habit; and free will is denied. So, even as knowledge of humanity supplants knowledge of God as the keystone of the system of knowledge, the scientific perspective on humanity starkly challenges humankind’s self-conception as occupying a privileged position in the order of nature.

Immanuel Kant explicitly enacts a revolution in epistemology modeled on the Copernican in astronomy. As characteristic of Enlightenment epistemology, Kant, in his Critique of Pure Reason (1781, second edition 1787) undertakes both to determine the limits of our knowledge, and at the same time to provide a foundation of scientific knowledge of nature, and he attempts to do this by examining our human faculties of knowledge critically. Even as he draws strict limits to rational knowledge, he attempts to defend reason as a faculty of knowledge, as playing a necessary role in natural science, in the face of skeptical challenges that reason faces in the period. According to Kant, scientific knowledge of nature is not merely knowledge of what in fact happens in nature, but knowledge of the causal laws of nature according to which what in fact happens must happen. But how is knowledge of necessary causal connection in nature possible? Hume’s investigation of the idea of cause had made clear that we cannot know causal necessity through experience; experience teaches us at most what in fact happens, not what must happen. In addition, Kant’s own earlier critique of principles of rationalism had convinced him that the principles of (“general”) logic also cannot justify knowledge of real necessary connections (in nature); the formal principle of non-contradiction can ground at best the deduction of one proposition from another, but not the claim that one property or event must follow from another in the course of nature. The generalized epistemological problem Kant addresses in the Critique of Pure Reason is: how is science possible (including natural science, mathematics, metaphysics), given that all such knowledge must be (or include) knowledge of real, substantive (not merely logical or formal) necessities. Put in the terms Kant defines, the problem is: how is synthetic, a priori knowledge possible?

According to Kant’s Copernican Revolution in epistemology addressed to this problem, objects must conform themselves to human knowledge rather than knowledge to objects. Certain cognitive forms lie ready in the human mind – prominent examples are the pure concepts of substance and cause and the forms of intuition, space and time; given sensible representations must conform themselves to these forms in order for human experience (as empirical knowledge of nature) to be possible at all. We can acquire scientific knowledge of nature because we constitute it a priori according to certain cognitive forms; for example, we can know nature as a causally ordered domain because we originally synthesize a priori the given manifold of sensibility according to the category of causality, which has its source in the human mind.

Kant saves rational knowledge of nature by limiting rational knowledge to nature. According to Kant’s argument, we can have rational knowledge only of the domain of possible experience, not of supersensible objects such as God and the soul. Moreover Kant’s solution brings with it a kind of idealism: given the mind’s role in constituting objects of experience, we know objects only as appearances , only as they appear according to our faculties, not as they are in themselves. This is the subjectivism of Kant’s epistemology. Kant’s epistemology exemplifies Enlightenment thought by replacing the theocentric conception of knowledge of the rationalist tradition with an anthropocentric conception.

However, Kant means his system to make room for humanity’s practical and religious aspirations toward the transcendent as well. According to Kant’s idealism, the realm of nature is limited to a realm of appearances, and we can intelligibly think supersensible objects such as God, freedom and the soul, though we cannot know them. Through the postulation of a realm of unknowable noumena (things in themselves) over against the realm of nature as a realm of appearances, Kant manages to make place for practical concepts that are central to our understanding of ourselves even while grounding our scientific knowledge of nature as a domain governed by deterministic causal laws. Though Kant’s idealism is highly controversial from its initial publication, a main point in its favor, according to Kant himself, is that it reconciles, in a single coherent tension, the main tension between the Enlightenment’s conception of nature, as ordered according to deterministic causal laws, and the Enlightenment’s conception of ourselves, as morally free, as having dignity, and as perfectible.

The commitment to careful observation and description of phenomena as the starting point of science, and then the success at explaining and accounting for observed phenomena through the method of induction, naturally leads to the development of new sciences for new domains in the Enlightenment. Many of the human and social sciences have their origins in the eighteenth century (e.g., history, anthropology, aesthetics, psychology, economics, even sociology), though most are only formally established as autonomous disciplines later. The emergence of new sciences is aided by the development of new scientific tools, such as models for probabilistic reasoning, a kind of reasoning that gains new respect and application in the period. Despite the multiplication of sciences in the period, the ideal remains to comprehend the diversity of our scientific knowledge as a unified system of science; however, this ideal of unity is generally taken as regulative, as an ideal to emerge in the ever-receding end-state of science, rather than as enforced from the beginning by regimenting science under a priori principles.

As exemplifying these and other tendencies of the Enlightenment, one work deserves special mention: the Encyclopedia , edited by Denis Diderot and Jean La Rond d’Alembert. The Encyclopedia (subtitled: “ systematic dictionary of the sciences, arts and crafts ”) was published in 28 volumes (17 of text, 11 of plates) over 21 years (1751–1772), and consists of over 70,000 articles, contributed by over 140 contributors, among them many of the luminaries of the French Enlightenment. The work aims to provide a compendium of existing human knowledge to be transmitted to subsequent generations, a transmission intended to contribute to the progress and dissemination of human knowledge and to a positive transformation of human society. The orientation of the Encyclopedia is decidedly secular and implicitly anti-authoritarian. Accordingly, the French state of the ancien régime censors the project, and it is completed only through the persistence of Diderot. The collaborative nature of the project, especially in the context of state opposition, contributes significantly to the formation of a shared sense of purpose among the wide variety of intellectuals who belong to the French Enlightenment. The knowledge contained in the Encyclopedia is self-consciously social both in its production – insofar as it is immediately the product of what the title page calls “a society of men of letters” – and in its address – insofar as it is primarily meant as an instrument for the education and improvement of society. It is a striking feature of the Encyclopedia , and one by virtue of which it exemplifies the Baconian conception of science characteristic of the period, that its entries cover the whole range and scope of knowledge, from the most abstract theoretical to the most practical, mechanical and technical.

2. The Good: Political Theory, Ethical Theory and Religion in the Enlightenment

The Enlightenment is most identified with its political accomplishments. The era is marked by three political revolutions, which together lay the basis for modern, republican, constitutional democracies: The English Revolution (1688), the American Revolution (1775–83), and the French Revolution (1789–99). The success at explaining and understanding the natural world encourages the Enlightenment project of re-making the social/political world, in accord with the models we allegedly find in our reason. Enlightenment philosophers find that the existing social and political orders do not withstand critical scrutiny. Existing political and social authority is shrouded in religious myth and mystery and founded on obscure traditions. The criticism of existing institutions is supplemented with the positive work of constructing in theory the model of institutions as they ought to be. We owe to this period the basic model of government founded upon the consent of the governed; the articulation of the political ideals of freedom and equality and the theory of their institutional realization; the articulation of a list of basic individual human rights to be respected and realized by any legitimate political system; the articulation and promotion of toleration of religious diversity as a virtue to be respected in a well ordered society; the conception of the basic political powers as organized in a system of checks and balances; and other now-familiar features of western democracies. However, for all the enduring accomplishments of Enlightenment political philosophy, it is not clear that human reason proves powerful enough to put a concrete, positive authoritative ideal in place of the objects of its criticism. As in the epistemological domain, reason shows its power more convincingly in criticizing authorities than in establishing them. Here too the question of the limits of reason is one of the main philosophical legacies of the period. These limits are arguably vividly illustrated by the course of the French Revolution. The explicit ideals of the French Revolution are the Enlightenment ideals of individual freedom and equality; but, as the revolutionaries attempt to devise rational, secular institutions to put in place of those they have violently overthrown, eventually they have recourse to violence and terror in order to control and govern the people. The devolution of the French Revolution into the Reign of Terror is perceived by many as proving the emptiness and hypocrisy of Enlightenment reason, and is one of the main factors which account for the end of the Enlightenment as an historical period.

The political revolutions of the Enlightenment, especially the French and the American, were informed and guided to a significant extent by prior political philosophy in the period. Though Thomas Hobbes, in his Leviathan (1651), defends the absolute power of the political sovereign, and is to that extent opposed to the revolutionaries and reformers in England, this work is a founding work of Enlightenment political theory. Hobbes’ work originates the modern social contract theory, which incorporates Enlightenment conceptions of the relation of the individual to the state. According to the general social contract model, political authority is grounded in an agreement (often understood as ideal, rather than real) among individuals, each of whom aims in this agreement to advance his rational self-interest by establishing a common political authority over all. Thus, according to the general contract model (though this is more clear in later contract theorists such as Locke and Rousseau than in Hobbes himself), political authority is grounded not in conquest, natural or divinely instituted hierarchy, or in obscure myths and traditions, but rather in the rational consent of the governed. In initiating this model, Hobbes takes a naturalistic, scientific approach to the question of how political society ought to be organized (against the background of a clear-eyed, unsentimental conception of human nature), and thus decisively influences the Enlightenment process of secularization and rationalization in political and social philosophy.

Baruch Spinoza also greatly contributes to the development of Enlightenment political philosophy in its early years. The metaphysical doctrines of the Ethics (1677) lay the groundwork for his influence on the age. Spinoza’s arguments against Cartesian dualism and in favor of substance monism, the claim in particular that there can only be one substance, God or nature, was taken to have radical implications in the domains of politics, ethics and religion throughout the period. Spinoza’s employment of philosophical reason leads to the denial of the existence of a transcendent, creator, providential, law-giving God; this establishes the opposition between the teachings of philosophy, on the one hand, and the traditional orienting practical beliefs (moral, religious, political) of the people, on the other hand, an opposition that is one important aspect of the culture of the Enlightenment. In his main political work, Tractatus Theologico-Politicus (1677), Spinoza, building on his rationalist naturalism, opposes superstition, argues for toleration and the subordination of religion to the state, and pronounces in favor of qualified democracy. Liberalism is perhaps the most characteristic political philosophy of the Enlightenment, and Spinoza, in this text primarily, is one of its originators.

However, John Locke’s Second Treatise of Government (1690) is the classical source of modern liberal political theory. In his First Treatise of Government , Locke attacks Robert Filmer’s Patriarcha (1680), which epitomizes the sort of political theory the Enlightenment opposes. Filmer defends the right of kings to exercise absolute authority over their subjects on the basis of the claim that they inherit the authority God vested in Adam at creation. Though Locke’s assertion of the natural freedom and equality of human beings in the Second Treatise is starkly and explicitly opposed to Filmer’s view, it is striking that the cosmology underlying Locke’s assertions is closer to Filmer’s than to Spinoza’s. According to Locke, in order to understand the nature and source of legitimate political authority, we have to understand our relations in the state of nature. Drawing upon the natural law tradition, Locke argues that it is evident to our natural reason that we are all absolutely subject to our Lord and Creator, but that, in relation to each other, we exist naturally in a state of equality “wherein all the power and jurisdiction is reciprocal, no one having more than another” ( Second Treatise , §4). We also exist naturally in a condition of freedom, insofar as we may do with ourselves and our possessions as we please, within the constraints of the fundamental law of nature. The law of nature “teaches all mankind … that, being all equal and independent, no one ought to harm another in his life, health, liberty, or possessions” (§6). That we are governed in our natural condition by such a substantive moral law, legislated by God and known to us through our natural reason, implies that the state of nature is not Hobbes’ war of all against all. However, since there is lacking any human authority over all to judge of disputes and enforce the law, it is a condition marred by “inconveniencies”, in which possession of natural freedom, equality and possessions is insecure. According to Locke, we rationally quit this natural condition by contracting together to set over ourselves a political authority, charged with promulgating and enforcing a single, clear set of laws, for the sake of guaranteeing our natural rights, liberties and possessions. The civil, political law, founded ultimately upon the consent of the governed, does not cancel the natural law, according to Locke, but merely serves to draw that law closer. “[T]he law of nature stands as an eternal rule to all men” (§135). Consequently, when established political power violates that law, the people are justified in overthrowing it. Locke’s argument for the right to revolt against a government that opposes the purposes for which legitimate government is taken by some to justify the political revolution in the context of which he writes (the English revolution) and, almost a hundred years later, by others to justify the American revolution as well.

Though Locke’s liberalism has been tremendously influential, his political theory is founded on doctrines of natural law and religion that are not nearly as evident as Locke assumes. Locke’s reliance on the natural law tradition is typical of Enlightenment political and moral theory. According to the natural law tradition, as the Enlightenment makes use of it, we can know through the use of our unaided reason that we all – all human beings, universally – stand in particular moral relations to each other. The claim that we can apprehend through our unaided reason a universal moral order exactly because moral qualities and relations (in particular human freedom and equality) belong to the nature of things, is attractive in the Enlightenment for obvious reasons. However, as noted above, the scientific apprehension of nature in the period does not support, and in fact opposes, the claim that the alleged moral qualities and relations (or, indeed, that any moral qualities and relations) are natural . According to a common Enlightenment assumption, as humankind clarifies the laws of nature through the advance of natural science and philosophy, the true moral and political order will be revealed with it. This view is expressed explicitly by the philosophe Marquis de Condorcet, in his Sketch for a Historical Picture of the Progress of the Human Mind (published posthumously in 1795 and which, perhaps better than any other work, lays out the paradigmatically Enlightenment view of history of the human race as a continual progress to perfection). But, in fact, advance in knowledge of the laws of nature in the science of the period does not help with discernment of a natural political or moral order. This asserted relationship between natural scientific knowledge and the political and moral order is under great stress already in the Enlightenment. With respect to Lockean liberalism, though his assertion of the moral and political claims (natural freedom, equality, et cetera) continues to have considerable force for us, the grounding of these claims in a religious cosmology does not. The question of how to ground our claims to natural freedom and equality is one of the main philosophical legacies of the Enlightenment.

The rise and development of liberalism in Enlightenment political thought has many relations with the rise of the mercantile class (the bourgeoisie) and the development of what comes to be called “civil society”, the society characterized by work and trade in pursuit of private property. Locke’s Second Treatise contributes greatly to the project of articulating a political philosophy to serve the interests and values of this ascending class. Locke claims that the end or purpose of political society is the preservation and protection of property (though he defines property broadly to include not only external property but life and liberties as well). According to Locke’s famous account, persons acquire rightful ownership in external things that are originally given to us all by God as a common inheritance, independently of the state and prior to its involvement, insofar as we “mix our labor with them”. The civil freedom that Locke defines, as something protected by the force of political laws, comes increasingly to be interpreted as the freedom to trade, to exchange without the interference of governmental regulation. Within the context of the Enlightenment, economic freedom is a salient interpretation of the individual freedom highly valued in the period. Adam Smith, a prominent member of the Scottish Enlightenment, describes in his An Inquiry into the Nature and Causes of the Wealth of Nations (1776) some of the laws of civil society, as a sphere distinct from political society as such, and thus contributes significantly to the founding of political economy (later called merely “economics”). His is one of many voices in the Enlightenment advocating for free trade and for minimal government regulation of markets. The trading house floor, in which people of various nationalities, languages, cultures, religions come together and trade, each in pursuit of his own self-interest, but, through this pursuit, supplying the wants of their respective nations and increasing its wealth, represents for some Enlightenment thinkers the benign, peaceful, universal rational order that they wish to see replace the violent, confessional strife that characterized the then-recent past of Europe.

However, the liberal conception of the government as properly protecting economic freedom of citizens and private property comes into conflict in the Enlightenment with the value of democracy. James Madison confronts this tension in the context of arguing for the adoption of the U.S. Constitution (in his Federalist #10). Madison argues that popular government (pure democracy) is subject to the evil of factions; in a pure democracy, a majority bound together by a private interest, relative to the whole, has the capacity to impose its particular will on the whole. The example most on Madison’s mind is that those without property (the many) may seek to bring about governmental re-distribution of the property of the propertied class (the few), perhaps in the name of that other Enlightenment ideal, equality. If, as in Locke’s theory, the government’s protection of an individual’s freedom is encompassed within the general end of protecting a person’s property, then, as Madison argues, the proper form of the government cannot be pure democracy, and the will of the people must be officially determined in some other way than by directly polling the people.

Jean-Jacques Rousseau’s political theory, as presented in his On the Social Contract (1762), presents a contrast to the Lockean liberal model. Though commitment to the political ideals of freedom and equality constitutes a common ground for Enlightenment political philosophy, it is not clear not only how these values have a home in nature as Enlightenment science re-conceives it, but also how concretely to interpret each of these ideals and how properly to balance them against each other. Contrary to Madison, Rousseau argues that direct (pure) democracy is the only form of government in which human freedom can be realized. Human freedom, according to Rousseau’s interpretation, is possible only through governance according to what he calls “the general will,” which is the will of the body politic, formed through the original contract, concretely determined in an assembly in which all citizens participate. Rousseau’s account intends to avert the evils of factions by structural elements of the original contract. The contract consists in the self-alienation by each associate of all rights and possessions to the body politic. Because each alienates all, each is an equal member of the body politic, and the terms and conditions are the same for all. The emergence of factions is avoided insofar as the good of each citizen is, and is understood to be, equally (because wholly) dependent on the general will. Legislation supports this identification with the general will by preserving the original equality established in the contract, prominently through maintaining a measure of economic equality. Rousseau’s account of the ideal relation of the individual citizen to the state differs from Locke’s; in Rousseau’s account, the individual must be actively engaged in political life in order to maintain the identification of his supremely authoritative will with the general will, whereas in Locke the emphasis is on the limits of governmental authority with respect to the expressions of the individual will. Though Locke’s liberal model is more representative of the Enlightenment in general, Rousseau’s political theory, which in some respects presents a revived classical model modified within the context of Enlightenment values, in effect poses many of the enduring questions regarding the meaning and interpretation of political freedom and equality within the modern state.

Both Madison and Rousseau, like most political thinkers of the period, are influenced by Baron de Montesquieu’s The Spirit of the Laws (1748), which is one of the founding texts of modern political theory. Though Montesquieu’s treatise belongs to the tradition of liberalism in political theory, given his scientific approach to social, legal and political systems, his influence extends beyond this tradition. Montesquieu argues that the system of legislation for a people varies appropriately with the particular circumstances of the people. He provides specific analysis of how climate, fertility of the soil, population size, et cetera, affect legislation. He famously distinguishes three main forms of governments: republics (which can either be democratic or aristocratic), monarchies and despotisms. He describes leading characteristics of each. His argument that functional democracies require the population to possess civic virtue in high measure, a virtue that consists in valuing public good above private interest, influences later Enlightenment theorists, including both Rousseau and Madison. He describes the threat of factions to which Madison and Rousseau respond in different (indeed opposite) ways. He provides the basic structure and justification for the balance of political powers that Madison later incorporates into the U.S. Constitution.

It is striking how unenlightened many of the Enlightenment’s celebrated thinkers are concerning issues of race and of gender (regarding race, see Race and Enlightenment: A Reader , edited by Emmanuel Chukwudi Eze). For all the public concern with the allegedly universal “rights of man” in the Enlightenment, the rights of women and of non-white people are generally overlooked in the period. (Mary Wollstonecraft’s Vindication of the Rights of Woman (1792) is a noteworthy exception.) When Enlightenment thinkers do turn their attention to the social standing of women or of non-white people, they tend to spout unreasoned prejudice. Moreover, while the philosophies of the Enlightenment generally aspire or pretend to universal truth, unattached to particular time, place or culture, Enlightenment writings are rife with rank ethno- and Eurocentrism, often explicit.

In the face of such tensions within the Enlightenment, one response is to affirm the power of the Enlightenment to improve humanity and society long beyond the end of the eighteenth century, indeed, down to the present day and into the future. This response embraces the Enlightenment and interprets more recent emancipation movements and achievement of recognition of the rights and dignity of traditionally oppressed and marginalized groups as expressions of Enlightenment ideals and aspirations. Critics of the Enlightenment respond differently to such tensions. Critics see them as symptoms of disorder, ideology, perversity, futility or falsehood that afflict the very core of the Enlightenment itself. (See James Schmidt’s “What Enlightenment Project?” for discussion of critics of the Enlightenment.) Famously, Adorno and Horkheimer interpret Nazi death camps as the result of “the dialectic of the Enlightenment”, as what historically becomes of the supremacy of instrumental reason asserted in the Enlightenment. As another example, we may point to some post-modern feminists, who argue, in opposition to the liberal feminists who embrace broadly Enlightenment ideals and conceptions, that the essentialism and universalism associated with Enlightenment ideals are both false and intrinsically hostile to the aspirations to self-realization of women and of other traditionally oppressed groups. (See Strickland and the essays in Akkerman and Stuurman.) This entry is not the place to delineate strains of opposition to the Enlightenment, but it is worth noting that post-Enlightenment social and political struggles to achieve equality or recognition for traditionally marginalized or oppressed groups are sometimes self-consciously grounded in the Enlightenment and sometimes marked by explicit opposition to the Enlightenment’s conceptions or presuppositions.

Many of the leading issues and positions of contemporary philosophical ethics take shape within the Enlightenment. Prior to the Enlightenment in the West, ethical reflection begins from and orients itself around religious doctrines concerning God and the afterlife. The highest good of humanity, and, accordingly, the content and grounding of moral duties, are conceived in immediately religious terms. During the Enlightenment, this changes, certainly within philosophy, but to some significant degree, within the population of western society at large. As the processes of industrialization, urbanization, and dissemination of education advance in this period, happiness in this life, rather than union with God in the next, becomes the highest end for more and more people. Also, the violent religious wars that bloody Europe in the early modern period motivate the development of secular, this-worldly ethics, insofar as they indicate the failure of religious doctrines concerning God and the afterlife to establish a stable foundation for ethics. In the Enlightenment, philosophical thinkers confront the problem of developing ethical systems on a secular, broadly naturalistic basis for the first time since the rise of Christianity eclipsed the great classical ethical systems. However, the changes in our understanding of nature and cosmology, effected by modern natural science, make recourse to the systems of Plato and Aristotle problematic. The Platonic identification of the good with the real and the Aristotelian teleological understanding of natural things are both difficult to square with the Enlightenment conception of nature. The general philosophical problem emerges in the Enlightenment of how to understand the source and grounding of ethical duties, and how to conceive the highest good for human beings, within a secular, broadly naturalistic context, and within the context of a transformed understanding of the natural world.

In ethical thought, as in political theory, Hobbes’ thought is an important provocation in the Enlightenment. Hobbes understands what is good, as the end of human action, to be “whatsoever is the object of any man’s appetite or desire,” and evil to be “the object of his hate, and aversion,” “there being nothing simply and absolutely so; nor any common rule of good and evil, to be taken from the nature of the objects themselves” ( Leviathan , chapter 6). Hobbes’ conception of human beings as fundamentally motivated by their perception of what is in their own best interest implies the challenge, important for Enlightenment moral philosophy, to construct moral duties of justice and benevolence out of such limited materials. The basis of human action that Hobbes posits is immediately intelligible and even shared with other animals to some extent; a set of moral duties constructed on this basis would also be intelligible, de-mystified, and fit within the larger scheme of nature. Bernard Mandeville is sometimes grouped with Hobbes in the Enlightenment, especially by critics of them both, because he too, in his popular Fable of the Bees; or, Private Vices, Public Benefits (1714), sees people as fundamentally motivated by their perceived self-interest, and then undertakes to tell a story about how moral virtue, which involves conquering one’s own appetite and serving the interests of others, can be understood to arise on this basis.

Samuel Clarke, an influential rationalist British thinker early in the Enlightenment, undertakes to show in his Discourse concerning the Unchangeable Obligations of Natural Religion (1706), against Hobbes, that the absolute difference between moral good and moral evil lies in the immediately discernible nature of things, independently of any compacts or positive legislation by God or human beings. Clarke writes that “in men’s dealing … one with another, it is undeniably more fit, absolutely and in the nature of the thing itself, that all men should endeavor to promote the universal good and welfare of all; than that all men should be continually contriving the ruin and destruction of all”. Likewise for the rest of what morality enjoins upon us. According to Clarke, that some actions (those we call morally good or required) are “fit to be done” and others not fit is grounded upon the immediately evident relations in which things stand to each other in nature, just as “the proportions of lines or numbers” are evident to the rational perception of a reasonable being. Similarly, Christian Wolff’s rationalist practical philosophy also grounds moral duties in an objective rational order. However, the objective quality on which moral requirements are grounded for Wolff is not the “fitness” of things to be done but rather their perfection. Wolff counts as a founder of the Aufklärung in part because of his attempted derivation of ethical duties from an order of perfection in things, discernable through reason, independently of divine commands.

Rationalist ethics so conceived faces the following obstacles in the Enlightenment. First, as implied above, it becomes increasingly implausible that the objective, mind-independent order is really as rationalist ethicists claim it to be. Second, even if the objective realm were ordered as the rationalist claims, it remains unclear how this order gives rise (on its own, as it were) to obligations binding on our wills. David Hume famously exposes the fallacy of deriving a prescriptive statement (that one ought to perform some action) from a description of how things stand in relation to each other in nature. Prima facie, there is a gap between the rationalist’s objective order and a set of prescriptions binding on our wills; if a supreme legislator must be re-introduced in order to make the conformity of our actions to that objective order binding on our wills, then the alleged existence of the objective moral order does not do the work the account asks of it in the first place.

Alongside the rationalist strand of ethical philosophy in the Enlightenment, there is also a very significant empiricist strand. Empirical accounts of moral virtue in the period are distinguished, both by grounding moral virtue on an empirical study of human nature, and by grounding cognition of moral duties and moral motivation in human sensibility, rather than in reason. The Third Earl of Shaftesbury, author of the influential work Characteristics of Men, Manners, Opinions, Times (1711), is a founding figure of the empiricist strand. Shaftesbury, like Clarke, is provoked by Hobbes’ egoism to provide a non-egoistic account of moral virtue. Shaftesbury conceives the core notion of the goodness of things teleologically: something is good if it contributes to the well-being or furtherance of the system of which it is a part. Individual animals are members of species, and therefore they are good as such insofar as they contribute to the well-being of the species of which they are a part. Thus, the good of things, including human beings, for Shaftesbury as for Clarke, is an objective quality that is knowable through reason. However, though we can know what is good through reason, Shaftesbury maintains that reason alone is not sufficient to motivate human action. Shaftesbury articulates the structure of a distinctively human moral sensibility. Moral sensibility depends on the faculty of reflection. When we reflect on first-order passions such as gratitude, kindness and pity, we find ourselves approving or liking them and disapproving or disliking their opposites. By virtue of our receptivity to such feelings, we are capable of virtue and have a sense of right and wrong. In this way, Shaftesbury defines the moral sense that plays a significant role in the theories of subsequent Enlightenment thinkers such as Francis Hutcheson and David Hume.

In the rationalist tradition, the conflict within the breast of the person between the requirements of morality and self-interest is canonically a conflict between the person’s reason and her passions. Shaftesbury’s identification of a moral sentiment in the nature of humanity renders this a conflict within sensibility itself, a conflict between different sentiments, between a self-interested sentiment and an unegoistic sentiment. Though both Shaftesbury and Hutcheson, no less than Clarke, oppose Hobbes’s egoism, it is nonetheless true that the doctrine of moral sensibility softens moral demands, so to speak. Doing what is morally right or morally good is intrinsically bound up with a distinctive kind of pleasure on their accounts. It is significant that both Shaftesbury and Hutcheson, the two founders of modern moral sense theory, articulate their ethical theory in conjunction with an aesthetic theory. Arguably the pleasure we feel in the apprehension of something beautiful is disinterested pleasure . Our susceptibility to aesthetic pleasure can be taken to reveal that we apprehend and respond to objective (or, anyway, universal) values, not only or necessarily on the basis of reason, but through our natural sensibility instead. Thus, aesthetics, as Shaftesbury and Hutcheson independently develop an account of it, gives encouragement to their doctrines of moral sensibility. But an account of moral virtue, unlike aesthetics, requires an account of moral motivation . As noted above, both Shaftesbury and Hutcheson want to do justice to the idea that proper moral motivation is not the pursuit of pleasure, even disinterested pleasure, but rather an immediate response to the perception of moral value. The problem of giving a satisfying account of moral motivation is a difficult one for empiricist moral philosophers in the Enlightenment.

While for Shaftesbury, at the beginning of the moral sense tradition, moral sense tracks a mind-independent order of value, David Hume, motivated in part by a more radical empiricism, is happy to let the objective order go. We have no access through reason to an independent order of value which moral sense would track. For Hume, morality is founded completely on our sentiments. Hume is often regarded as the main originator of so-called “ethical subjectivism”, according to which moral judgments or evaluations (regarding actions or character) do not make claims about independent facts but merely express the subject’s feelings or attitudes with respect to actions or character. Such subjectivism is relieved of the difficult task of explaining how the objective order of values belongs to the natural world as it is being reconceived by natural science in the period; however, it faces the challenge of explaining how error and disagreement in moral judgments and evaluations are possible. Hume’s account of the standards of moral judgment follows that of Hutcheson in relying centrally on the “natural” responses of an ideal observer or spectator.

Hume’s ethics is exemplary of philosophical ethics in the Enlightenment by virtue of its belonging to the attempt to provide a new, empirically grounded science of human nature, free of theological presuppositions. As noted above, the attempts by the members of the French Enlightenment to present a new understanding of human nature are strongly influenced by Locke’s “sensationalism”, which, radicalized by Condillac, amounts to the attempt to base all contents and faculties of the human mind on the senses. Typically, the French philosophes draw more radical or iconoclastic implications from the new “science of man” than English or Scottish Enlightenment figures. Claude-Adrien Helvétius (1715–1771) is typical here. In De l’ésprit (1758), Helvétius follows the Lockean sensationalism of Condillac and pairs it with the claim that human beings are motivated in their actions only by the natural desire to maximize their own pleasure and minimize their pain. De l’ésprit , though widely read, gives rise to strong negative reactions in the time, both by political and religious authorities (the Sorbonne, the Pope and the Parlement of Paris all condemn the book) and by prominent fellow philosophes , in great part because Helvétius’s psychology seems to critics to render moral imperatives and values without basis, despite his best attempts to derive them. Helvétius attempts to ground the moral equality of all human beings by portraying all human beings, whatever their standing in the social hierarchy, whatever their special talents and gifts, as equally products of the nature we share plus the variable influences of education and social environment. But, to critics, Helvétius’s account portrays all human beings as equal only by virtue of portraying all as equally worthless (insofar as the claim to equality is grounded on all being equally determined by external factors). However, Helvétius’s ideas, in De l’ésprit as well as in its posthumously published sequel De l’homme (1772), exert a great deal of influence, especially his case for the role of pleasure and pain in human motivation and the role of education and social incentives in shaping individuals into contributors to the social good. Helvétius is sometimes regarded as the father of modern utilitarianism through his articulation of the greatest happiness principle and through his influence on Bentham.

Helvétius is typical in the respect that he is radical in the revisions he proposes, not in common moral judgments or customs of the time, but rather regarding the philosophical grounding of those judgments and customs. But there are some philosophers in the Enlightenment who are radical in the revisions they propose regarding the content of ethical judgments themselves. The Marquis de Sade is merely the most notorious example, among a set of Enlightenment figures (including also the Marquis de Argens and Diderot himself in some of his writings) who, within the context of the new naturalism and its emphasis on the pursuit of pleasure, celebrate the avid pursuit of sexual pleasure and explicitly challenge the sexual mores, as well as the wider morality, of their time. The more or less fictionalized, philosophically self-conscious “libertine” is one significant expression of Enlightenment ethical thought.

If the French Enlightenment tends to advance this-worldly happiness as the highest good for human beings more insistently than the Enlightenment elsewhere, then Rousseau’s voice is, in this as in other respects, a discordant voice in that context. Rousseau advances the cultivation and realization of human freedom as the highest end for human beings and thereby gives expression to another side of Enlightenment ethics. As Rousseau describes it, the capacity for individual self-determination puts us in a problematic relation to our natural desires and inclinations and to the realm of nature generally, insofar as that realm is constituted by mechanistic causation. Though Rousseau places a great deal of emphasis on human freedom, and makes significant contributions to our understanding of ourselves as free, he does not address very seriously the problem of the place of human freedom in the cosmos as it is conceived within the context of Enlightenment naturalism.

However, Rousseau’s writings help Kant to the articulation of a practical philosophy that addresses many of the tensions in the Enlightenment. Kant follows Rousseau, and disagrees with empiricism in ethics in the period, in emphasizing human freedom, rather than human happiness, as the central orienting concept of practical philosophy. Though Kant presents the moral principle as a principle of practical reason, his ethics also disagrees significantly with rationalist ethics in the period. According to Kant, rationalists such as Wolff, insofar as they take moral prescriptions to follow from an end given to the will (in Wolff’s case, the end of perfection), do not understand us as autonomous in our moral activity. Through interpreting the faculty of the will itself as practical reason, Kant understands the moral principle as internally legislated, thus as not only compatible with freedom, but as equivalent to the principle of a free will, as a principle of autonomy. As noted above, rationalists in ethics in the period are challenged to explain how the objective moral order which reason in us allegedly discerns gives rise to valid prescriptions binding on our wills (the gap between is and ought ). For Kant, the moral order is not independent of our will, but rather represents the formal constraints of willing as such. Kant’s account thus both avoids the is-ought gap and interprets moral willing as expressive of our freedom.

Moreover, by virtue of his interpretation of the moral principle as the principle of pure practical reason, Kant is able to redeem the ordinary sense of moral requirements as over-riding, as potentially opposed to the claims of one’s happiness, and thus as different in kind from the deliverances of prudential reasoning. This ordinary sense of moral requirements is not easily accommodated within the context of Enlightenment empiricism and naturalism. Kant’s stark dichotomy between a person’s practical reason and her sensible nature is strongly criticized, both by the subsequent Romantic generation and in the contemporary context; but this dichotomy is bound up with an important benefit of Kant’s view – much promoted by Kant himself – within the context of the Enlightenment. Elaborated in the context of Kant’s idealism as a contrast between the “realm of freedom” and the “realm of nature”, the dichotomy enables Kant’s proposed solution to the conflict between freedom and nature that besets Enlightenment thought. As noted above, Kant argues that the application of the causal principle is restricted to the realm of nature, thus making room for freedom, compatibly with the causal determination of natural events required by scientific knowledge. Additionally, Kant attempts to show that morality “leads ineluctably to” religious belief (in the supersensible objects of God and of the immortal soul) while being essentially not founded on religious belief, thus again vindicating the ordinary understanding of morality while still furthering Enlightenment values and commitments.

Though the Enlightenment is sometimes represented as the enemy of religion, it is more accurate to see it as critically directed against various (arguably contingent) features of religion, such as superstition, enthusiasm, fanaticism and supernaturalism. Indeed the effort to discern and advocate for a religion purified of such features – a “rational” or “natural” religion – is more typical of the Enlightenment than opposition to religion as such. Even Voltaire, who is perhaps the most persistent, powerful, vocal Enlightenment critic of religion, directs his polemic mostly against the Catholic Church in France – “ l’infâme ” in his famous sign-off in his letters, “ Écrasez l’infâme ” (“Crush the infamous”) refers to the Church, not to religion as such. However, controversy regarding the truth-value or reasonableness of religious belief in general, Christian belief in particular, and controversy regarding the proper place of religion in society, occupies a particularly central place in the Enlightenment. It’s as if the terrible, violent confessional strife in the early modern period in Europe, the bloody drawn-out wars between the Christian sects, was removed to the intellectual arena in the Enlightenment and became a set of more general philosophical controversies.

Alongside the rise of the new science, the rise of Protestantism in western Christianity also plays an important role in generating the Enlightenment. The original Protestants assert a sort of individual liberty with respect to questions of faith against the paternalistic authority of the Church. The “liberty of conscience”, so important to Enlightenment thinkers in general, and asserted against all manner of paternalistic authorities (including Protestant), descends from this Protestant assertion. The original Protestant assertion initiates a crisis of authority regarding religious belief, a crisis of authority that, expanded and generalized and even, to some extent, secularized, becomes a central characteristic of the Enlightenment spirit. The original Protestant assertion against the Catholic Church bases itself upon the authority of scripture. However, in the Enlightenment, the authority of scripture is strongly challenged, especially when taken literally. Developing natural science renders acceptance of a literal version of the Bible increasingly untenable. But authors such as Spinoza (in his Tractatus Theologico-Politicus ) present ways of interpreting scripture according to its spirit, rather than its letter, in order to preserve its authority and truth, thus contributing to the Enlightenment controversy of whether some rationally purified version of the religion handed down in the culture belongs to the true philosophical representation of the world or not; and, if so, what its content is.

It is convenient to discuss religion in the Enlightenment by presenting four characteristic forms of Enlightenment religion in turn: deism, religion of the heart, fideism and atheism.

Deism . Deism is the form of religion most associated with the Enlightenment. According to deism, we can know by the natural light of reason that the universe is created and governed by a supreme intelligence; however, although this supreme being has a plan for creation from the beginning, the being does not interfere with creation; the deist typically rejects miracles and reliance on special revelation as a source of religious doctrine and belief, in favor of the natural light of reason. Thus, a deist typically rejects the divinity of Christ, as repugnant to reason; the deist typically demotes the figure of Jesus from agent of miraculous redemption to extraordinary moral teacher. Deism is the form of religion fitted to the new discoveries in natural science, according to which the cosmos displays an intricate machine-like order; the deists suppose that the supposition of God is necessary as the source or author of this order. Though not a deist himself, Isaac Newton provides fuel for deism with his argument in his Opticks (1704) that we must infer from the order and beauty in the world to the existence of an intelligent supreme being as the cause of this order and beauty. Samuel Clarke, perhaps the most important proponent and popularizer of Newtonian philosophy in the early eighteenth century, supplies some of the more developed arguments for the position that the correct exercise of unaided human reason leads inevitably to the well-grounded belief in God. He argues that the Newtonian physical system implies the existence of a transcendent cause, the creator God. In his first set of Boyle lectures, A Demonstration of the Being and Attributes of God (1705), Clarke presents the metaphysical or “argument a priori ” for God’s existence. This argument concludes from the rationalist principle that whatever exists must have a sufficient reason or cause of its existence to the existence of a transcendent, necessary being who stands as the cause of the chain of natural causes and effects. Clarke also supports the empirical argument from design, the argument that concludes from the evidence of order in nature to the existence of an intelligent author of that order. In his second set of Boyle lectures, A Discourse Concerning the Unchangeable Obligations of Natural Religion (1706), Clarke argues as well that the moral order revealed to us by our natural reason requires the existence of a divine legislator and an afterlife, in which the supreme being rewards virtue and punishes vice. In his Boyle lectures, Clarke argues directly against the deist philosophy and maintains that what he regards as the one true religion, Christianity, is known as such on the basis of miracles and special revelation; still, Clarke’s arguments on the topic of natural religion are some of the best and most widely-known arguments in the period for the general deist position that natural philosophy in a broad sense grounds central doctrines of a universal religion.

Enlightenment deism first arises in England. In On the Reasonableness of Christianity (1695), Locke aims to establish the compatibility of reason and the teachings of Christianity. Though Locke himself is (like Newton, like Clarke) not a deist, the major English deists who follow (John Toland, Christianity Not Mysterious [1696]); Anthony Collins, A Discourse of Freethinking [1713]; Matthew Tindal, Christianity as Old as Creation [1730]) are influenced by Locke’s work. Voltaire carries deism across the channel to France and advocates for it there over his long literary career. Toward the end-stage, the farcical stage, of the French Revolution, Robespierre institutes a form of deism, the so-called “Cult of the Supreme Being”, as the official religion of the French state. Deism plays a role in the founding of the American republic as well. Many of the founding fathers (Jefferson, Franklin, Madison, Paine) author statements or tracts that are sympathetic to deism; and their deistic sympathies influence the place given (or not given) to religion in the new American state that they found.

Religion of the Heart . Opposition to deism derives sometimes from the perception of it as coldly rationalistic. The God of the deists, arrived at through a priori or empirical argument and referred to as the Prime Mover or Original Architect, is often perceived as distant and unconcerned with the daily struggles of human existence, and thus as not answering the human needs from which religion springs in the first place. Some important thinkers of the Enlightenment – notably Shaftesbury and Rousseau – present religion as founded on natural human sentiments, rather than on the operations of the intellect. Rousseau has his Savoyard Vicar declare, in his Profession of Faith in Emile (1762), that the idea of worshiping a beneficent deity arose in him initially as he reflected on his own situation in nature and his “heart began to glow with a sense of gratitude towards the author of our being”. The Savoyard Vicar continues: “I adore the supreme power, and melt into tenderness at his goodness. I have no need to be taught artificial forms of worship; the dictates of nature are sufficient. Is it not a natural consequence of self-love to honor those who protect us, and to love such as do us good?” This “natural” religion – opposed to the “artificial” religions enforced in the institutions – is often classed as a form of deism. But it deserves separate mention, because of its grounding in natural human sentiments, rather than in reason or in metaphysical or natural scientific problems of cosmology.

Fideism . Deism or natural religion of various sorts tends to rely on the claim that reason or human experience supports the hypothesis that there is a supreme being who created or authored the world. In one of the most important philosophical texts on natural religion to appear during the Enlightenment, David Hume’s Dialogues Concerning Natural Religion (published posthumously in 1779), this supposition is criticized relentlessly, incisively and in detail. Naturally, the critical, questioning attitude characteristic of the Enlightenment in general is directed against the arguments on which natural religion is based. In Part Nine of the Dialogues, Samuel Clarke’s “argument a priori” (as defended by the character Demea) is dispatched fairly quickly, but with a battery of arguments. But Hume is mainly concerned in the Dialogues with the other major pillar of natural religion in the Enlightenment, the “empirical” argument, the teleological argument or the argument from design. Cleanthes, the character who advances the design argument in the dialogue, proceeds from the rule for empirical reasoning that like effects prove like causes. He reasons that, given the resemblance between nature, which displays in many respects a “curious adaptation of means to ends”, and a man-made machine, we must infer the cause of nature to be an intelligence like ours, though greater in proportion as nature surpasses in perfection the products of human intelligence. Philo, the skeptical voice in the Dialogues , presses Cleanthes’ argument on many fronts. He points out that the argument is only as strong as the similarity between nature or parts of nature and man-made machines, and further, that a close scrutiny reveals that analogy to be weak. Moreover, according to the principle of the argument, the stronger the evidence for an author (or authors) of nature, the more like us that author (or authors) should be taken to be. Consequently, according to Philo, the argument does not support the conclusion that God exists, taking God to be unitary, infinite, perfect, et cetera. Also, although the existence of evil and disorder in nature may serve actually to strengthen the case for the argument, given the disorder in human creations as well, the notion that God authors evil and disorder is disturbing. If one denies that there is disorder and evil in nature, however implausibly, the effect is to emphasize again the dissimilarity between nature and human products and thus weaken the central basis of the argument. With these and other considerations, Philo puts the proponent of the empirical argument in a difficult dialectical position. But Cleanthes is not moved. He holds the inference from the phenomenon of the curious adaptation of means to ends in nature to the existence of an intelligent and beneficent author to be so natural as to be impervious to the philosophical cavils raised by Philo. And, in the ambiguous conclusion of the work, Philo seems to agree. Though Hume himself seems to have been an atheist, one natural way to take the upshot of his Dialogues is that religious belief is so “natural” to us that rational criticism cannot unseat it. The ambiguous upshot of the work can be taken to be the impotence of rational criticism in the face of religious belief, rather than the illegitimacy of religious belief in the face of rational criticism. This tends toward fideism, the view according to which religious faith maintains its truth over against philosophical reasoning, which opposes but cannot defeat it. Fideism is most often associated with thinkers whose beliefs run contrary to the trends of the Enlightenment (Blaise Pascal, Johann-Georg Hamann, Søren Kierkegaard), but the skeptical strain in the Enlightenment, from Pierre Bayle through David Hume, expresses itself not only in atheism, but also in fideism.

Atheism . Atheism is more present in the French Enlightenment than elsewhere. In the writings of Denis Diderot, atheism is partly supported by an expansive, dynamic conception of nature. According to the viewpoint developed by Diderot, we ought to search for the principles of natural order within natural processes themselves, not in a supernatural being. Even if we don’t yet know the internal principles for the ordering and development of natural forms, the appeal to a transcendent author of such things is reminiscent, to Diderot’s ear, of the appeal to Aristotelian “substantial forms” that was expressly rejected at the beginning of modern science as explaining nothing. The appeal to a transcendent author does not extend our understanding, but merely marks and fixes the limits of it. Atheism (combined with materialism) in the French Enlightenment is perhaps most identified with the Baron d’Holbach, whose System of Nature (1770) generated a great deal of controversy at the time for urging the case for atheism explicitly and emphatically. D’Holbach’s system of nature is strongly influenced by Diderot’s writings, though it displays less subtlety and dialectical sophistication. Though most Enlightenment thinkers hold that morality requires religion, in the sense that morality requires belief in a transcendent law-giver and in an after-life, d’Holbach (influenced in this respect by Spinoza, among others) makes the case for an ethical naturalism, an ethics that is free of any reference to a supernatural grounding or aspiration. Like Helvétius before him, d’Holbach presents an ethics in which virtue consists in enlightened self-interest. The metaphysical background of the ethics he presents is deterministic materialism. The Prussian enlightened despot, Frederick the Great, famously criticizes d’Holbach’s book for exemplifying the incoherence that troubles the Enlightenment generally: while d’Holbach provides passionate moral critiques of existing religious and social and political institutions and practices, his own materialist, determinist conception of nature allows no place for moral “oughts” and prescriptions and values.

3. The Beautiful: Aesthetics in the Enlightenment

Modern systematic philosophical aesthetics not only first emerges in the context of the Enlightenment, but also flowers brilliantly there. As Ernst Cassirer notes, the eighteenth century not only thinks of itself as the “century of philosophy”, but also as “the age of criticism,” where criticism is centrally (though not only) art and literary criticism (Cassirer 1932, 255). Philosophical aesthetics flourishes in the period because of its strong affinities with the tendencies of the age. Alexander Baumgarten, the German philosopher in the school of Christian Wolff, founds systematic aesthetics in the period, in part through giving it its name. “Aesthetics” is derived from the Greek word for “senses”, because for Baumgarten a science of the beautiful would be a science of the sensible, a science of sensible cognition. The Enlightenment in general re-discovers the value of the senses, not only in cognition, but in human lives in general, and so, given the intimate connection between beauty and human sensibility, the Enlightenment is naturally particularly interested in aesthetics. Also, the Enlightenment includes a general recovery and affirmation of the value of pleasure in human lives, against the tradition of Christian asceticism, and the flourishing of the arts, of the criticism of the arts and of the philosophical theorizing about beauty, promotes and is promoted by this recovery and affirmation. The Enlightenment also enthusiastically embraces the discovery and disclosure of rational order in nature, as manifest most clearly in the development of the new science. It seems to many theorists in the Enlightenment that the faculty of taste, the faculty by which we discern beauty, reveals to us some part of this order, a distinctive harmony, unities amidst variety. Thus, in the phenomenon of aesthetic pleasure, human sensibility discloses to us rational order, thus binding together two enthusiasms of the Enlightenment.

In the early Enlightenment, especially in France, the emphasis is upon the discernment of an objective rational order, rather than upon the subject’s sensual aesthetic pleasure. Though Descartes’ philosophical system does not include a theory of taste or of beauty, his mathematical model of the physical universe inspires the aesthetics of French classicism. French classicism begins from the classical maxim that the beautiful is the true. Nicolas Boileau writes in his influential didactic poem, The Art of Poetry (1674), in which he lays down rules for good versification within different genres, that “Nothing is beautiful but the true, the true alone is lovable.” In the period the true is conceived of as an objective rational order. According to the classical conception of art that dominates in the period, art imitates nature, though not nature as given in disordered experience, but the ideal nature, the ideal in which we can discern and enjoy “unity in multiplicity.” In French classicism, aesthetics is very much under the influence of, and indeed modeled on, systematic, rigorous theoretical science of nature. Just as in Descartes’ model of science, where knowledge of all particulars depends on prior knowledge of the principle from which the particulars are deduced, so also in the aesthetics of French classicism, the demand is for systematization under a single, universal principle. The subjection of artistic phenomena to universal rules and principles is expressed, for example, in the title of Charles Batteaux’s main work, The Fine Arts Reduced to a Single Principle (1746), as well as in Boileau’s rules for good versification.

In Germany in the eighteenth century, Christian Wolff’s systematic rationalist metaphysics forms the basis for much of the reflection on aesthetics, though sometimes as a set of doctrines to be argued against. Wolff affirms the classical dictum that beauty is truth; beauty is truth perceived through the feeling of pleasure. Wolff understands beauty to consist in the perfection in things, which he understands in turn to consist in a harmony or order of a manifold. We judge something beautiful through a feeling of pleasure when we sense in it this harmony or perfection. Beauty is, for Wolff, the sensitive cognition of perfection. Thus, for Wolff, beauty corresponds to objective features of the world, but judgments of beauty are relative to us also, insofar as they are based on the human faculty of sensibility.

Though philosophical rationalism forms the basis of aesthetics in the early Enlightenment in France and Germany, thinkers in the empiricist tradition in England and Scotland introduce many of the salient themes of Enlightenment aesthetics. In particular, with the rise of empiricism and subjectivism in this domain, attention shifts to the ground and nature of the subject’s experience of beauty, the subject’s aesthetic response. Lord Shaftesbury, though not himself an empiricist or subjectivist in aesthetics, makes significant contributions to this development. Shaftesbury re-iterates the classical equation, “all beauty is truth,” but the truth that beauty is for Shaftesbury is not an objective rational order that could also be known conceptually. Though beauty is, for Shaftesbury, a kind of harmony that is independent of the human mind, under the influence of Plotinus, he understands the human being’s immediate intuition of the beautiful as a kind of participation in the original harmony. Shaftesbury focuses attention on the nature of the subject’s response to beauty, as elevating the person, also morally. He maintains that aesthetic response consists in a disinterested unegoistic pleasure; the discovery of this capacity for disinterested pleasure in harmony shows the way for the development of his ethics that has a similar grounding. And, in fact, in seeing aesthetic response as elevating oneself above self-interested pursuits, through cultivating one’s receptivity to disinterested pleasure, Shaftesbury ties tightly together aesthetics and ethics, morality and beauty, and in that respect also contributes to a trend of the period. Also, in placing the emphasis on the subject’s response to beauty, rather than on the objective characteristics of the beautiful, Shaftesbury makes aesthetics belong to the general Enlightenment interest in human nature. Thinkers of the period find in our receptivity to beauty a key both to understanding both distinctively human nature and its perfection.

Francis Hutcheson follows Shaftesbury in his emphasis on the subject’s aesthetic response, on the distinctive sort of pleasure that the beautiful elicits in us. Partly because the Neo-Platonic influence, so pronounced in Shaftesbury’s aesthetics, is washed out of Hutcheson’s, to be replaced by a more thorough-going empiricism, Hutcheson understands this distinctive aesthetic pleasure as more akin to a secondary quality. Thus, Hutcheson’s aesthetic work raises the prominent question whether “beauty” refers to something objective at all or whether beauty is “nothing more” than a human idea or experience. As in the domain of Enlightenment ethics, so with Enlightenment aesthetics too, the step from Shaftesbury to Hutcheson marks a step toward subjectivism. Hutcheson writes in one of his Two Treatises , his Inquiry Concerning Beauty, Order, Harmony, Design (1725) that “the word ‘beauty’ is taken for the idea raised in us , and a sense of beauty for our power of receiving this idea ” (Section I, Article IX). However, though Hutcheson understands beauty to be an idea in us, he takes this idea to be “excited” or “occasioned” in us by distinctive objective qualities, in particular by objects that display “ uniformity amidst variety ” (ibid., Section II, Article III). In the very title of Hutcheson’s work above, we see the importance of the classical ideas of (rational) order and harmony in Hutcheson’s aesthetic theory, even as he sets the tenor for much Enlightenment discussion of aesthetics through placing the emphasis on the subjective idea and aesthetic response.

David Hume’s famous essay on “the standard of taste” raises and addresses the epistemological problem raised by subjectivism in aesthetics. If beauty is an idea in us, rather than a feature of objects independent of us, then how do we understand the possibility of correctness and incorrectness – how do we understand the possibility of standards of judgment – in this domain? The problem is posed more clearly for Hume because he intensifies Hutcheson’s subjectivism. He writes in the Treatise that “pleasure and pain….are not only necessary attendants of beauty and deformity, but constitute their very essence” ( Treatise , Book II, part I, section viii). But if a judgment of taste is based on, or expresses, subjective sentiments, how can it be incorrect? In his response to this question, Hume accounts for the expectation of agreement in judgments of taste by appealing to the fact that we share a common human nature, and he accounts for ‘objectivity’ or expertise in judgments of taste, within the context of his subjectivism, by appealing to the normative responses of well-placed observers. Both of these points (the commonality of human nature and the securing of ‘objectivity’ in judgments based on sentiments by appeal to the normative responses of appropriately placed observers) are typical of the period more generally, and especially of the strong empiricist strain in the Enlightenment. Hume develops the empiricist line in aesthetics to the point where little remains of the classical emphasis on the order or harmony or truth that is, according to the French classicists, apprehended and appreciated in our aesthetic responses to the beautiful, and thus, according to the classicists, the ground of aesthetic responses.

Immanuel Kant faces squarely the problem of the normativity of judgments of taste. Influenced by Hutcheson and the British empiricist tradition in general, Kant understands judgments of taste to be founded on a distinctive sort of feeling, a disinterested pleasure. In taking judgments of taste to be subjective (they are founded on the subject’s feeling of pleasure) and non-cognitive (such judgments do not subsume representations under concepts and thus do not ascribe properties to objects), Kant breaks with the German rationalist school. However Kant continues to maintain that judgments of beauty are like cognitive judgments in making a legitimate claim to universal agreement – in contrast to judgments of the agreeable. The question is how to vindicate the legitimacy of this demand. Kant argues that the distinctive pleasure underlying judgments of taste is the experience of the harmony of the faculties of the imagination and the understanding, a harmony that arises through their “free play” in the process of cognizing objects on the basis of given sensible intuition. The harmony is “free” in an experience of beauty in the sense that it is not forced by rules of the understanding, as is the agreement among the faculties in acts of cognition. The order and harmony that we experience in the face of the beautiful is subjective, according to Kant; but it is at the same time universal and normative, by virtue of its relation to the conditions of human cognition.

The emphasis Kant places on the role of the activity of the imagination in aesthetic pleasure and discernment typifies a trend in Enlightenment thought. Whereas early in the Enlightenment, in French classicism, and to some extent in Christian Wolff and other figures of German rationalism, the emphasis is on the more-or-less static rational order and proportion and on rigid universal rules or laws of reason, the trend during the development of Enlightenment aesthetics is toward emphasis on the play of the imagination and its fecundity in generating associations.

Denis Diderot is an important and influential author on aesthetics. He wrote the entry “On the Origin and Nature of the Beautiful” for the Encyclopedia (1752). Like Lessing in Germany, Diderot not only philosophized about art and beauty, but also wrote plays and influential art criticism. Diderot is strongly influenced in his writings on aesthetics by the empiricism in England and Scotland, but his writing is not limited to that standpoint. Diderot repeats the classical dictum that art should imitate nature, but, whereas, for French classicists, the nature that art should imitate is ideal nature – a static, universal rational order – for Diderot, nature is dynamic and productive. For Diderot, the nature the artist ought to imitate is the real nature we experience, warts and all (as it were). The particularism and realism of Diderot’s aesthetics is based on a critique of the standpoint of French classicism (see Cassirer 1935, p. 295f.). This critique exposes the artistic rules represented by French classicists as universal rules of reason as nothing more than conventions marking what is considered proper within a certain tradition. In other words, the prescriptions within the French classical tradition are artificial , not natural , and constitute fetters to artistic genius. Diderot takes liberation from such fetters to come from turning to the task of observing and imitating actual nature . Diderot’s emphasis on the primeval productive power and abundance of nature in his aesthetic writings contributes to the trend toward focus on artistic creation and expression (as opposed to artistic appreciation and discernment) that is a characteristic of the late Enlightenment and the transition to Romanticism.

Lessing’s aesthetic writings play an important role in elevating the aesthetic category of expressiveness. In his famous Laocoön: An Essay on the Limits of Painting and Poetry (1766), Lessing argues, by comparing the famous Greek statue with the representation of Laocoön’s suffering in Virgil’s poetry, that the aims of poetry and of the visual arts are not identical; he argues that the aim of poetry is not beauty, but expression. In elevating the aesthetic category of expressiveness, Lessing challenges the notion that all art is imitation of nature. His argument also challenges the notion that all the various arts can be deduced from a single principle. Lessing’s argument in Laocoön supports the contrary thesis that the distinct arts have distinct aims and methods, and that each should be understood on its own terms, not in terms of an abstract general principle from which all arts are to be deduced. For some, especially for critics of the Enlightenment, in this point Lessing is already beyond the Enlightenment. Certainly it is true that the emphasis on the individual or particular, over against the universal, which one finds in other late Enlightenment thinkers, is in tension with Enlightenment tenets. Herder (following Hamann to some extent) argues that each individual art object has to be understood in its own terms, as a totality complete unto itself. With Herder’s stark emphasis on individuality in aesthetics, over against universality, the supplanting of the Enlightenment with Romanticism and Historicism is well advanced. But, according to the point of view taken in this entry, the conception of the Enlightenment according to which it is distinguished by its prioritization of the order of abstract, universal laws and principles, over against concrete particulars and the differences amongst them, is too narrow; it fails to account for much of the characteristic richness in the thought of the period. Indeed aesthetics itself, as a discipline, which, as noted, is founded in the Enlightenment by the German rationalist, Alexander Baumgarten, owes its existence to the tendency in the Enlightenment to search for and discover distinct laws for distinct kinds of phenomena (as opposed to insisting that all phenomena be made intelligible through the same set of general laws and principles). Baumgarten founds aesthetics as a ‘science’ through the attempt to establish the sensible domain as cognizable in a way different from that which prevails in metaphysics. Aesthetics in Germany in the eighteenth century, from Wolff to Herder, both typifies many of the trends of the Enlightenment and marks the field where the Enlightenment yields to competing worldviews.

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How to cite this entry . Preview the PDF version of this entry at the Friends of the SEP Society . Look up topics and thinkers related to this entry at the Internet Philosophy Ontology Project (InPhO). Enhanced bibliography for this entry at PhilPapers , with links to its database.

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aesthetics: British, in the 18th century | aesthetics: French, in the 18th century | aesthetics: German, in the 18th century | Bacon, Francis | Bayle, Pierre | Burke, Edmund | Clarke, Samuel | Collins, Anthony | Condillac, Étienne Bonnot de | Condorcet, Marie-Jean-Antoine-Nicolas de Caritat, Marquis de: in the history of feminism | cosmopolitanism | Descartes, René | emotion: 17th and 18th century theories of | ethics: natural law tradition | German Philosophy: in the 18th century, prior to Kant | Holbach, Paul-Henri Thiry (Baron) d’ | Hume, David | Kant, Immanuel | Kant, Immanuel: aesthetics and teleology | Locke, John | Mendelssohn, Moses | Montesquieu, Charles-Louis de Secondat, Baron de | Newton, Isaac | Reid, Thomas | Scottish Philosophy: in the 18th Century | Shaftesbury, Lord [Anthony Ashley Cooper, 3rd Earl of] | toleration | Vico, Giambattista | Voltaire | Wolff, Christian

Acknowledgments

Mark Alznauer, Margaret Atherton, Kyla Ebels-Duggan, Alan Nelson, Julius Sensat and Rachel Zuckert provided helpful comments on an earlier draft, which lead to substantial revisions.

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13: The Enlightenment

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• Christopher Brooks
• Portland Community College

In 1784, a Prussian philosopher named Immanuel Kant published a short essay entitled What is Enlightenment? He was responding to nearly a century of philosophical, scientific, and technical advances in Central and Western Europe that, he felt, had culminated in his own lifetime in a more enlightened and just age. According to Kant, Enlightenment was all about the courage to think for one's self, to question the accepted notions of any field of human knowledge rather than relying on a belief imposed by an outside authority. Likewise, he wrote, ideas were now exchanged between thinkers in a network of learning that itself provided a kind of intellectual momentum. Kant's point was that, more than ever before, thinkers of various kinds were breaking new ground not only in using the scientific method to discover new things about the physical world, but in applying rational inquiry toward improving human life and the organization of human society. While Kant's essay probably overstated the Utopian qualities of the thought of his era, he was right that it did correspond to a major shift in how educated Europeans thought about the world and the human place in it.

Following Kant, historians refer to the intellectual movement of the eighteenth century as the Enlightenment. Historians now tend to reject the idea that the Enlightenment was a single, self-conscious movement of thinkers, but they still (usually) accept that there were indeed innovative new themes of thought running through much of the philosophical, literary, and technical writing of the period. Likewise, new forms of media and new forums of discussion came of age in the eighteenth century, creating a larger and better-informed public than ever before in European history.

• 13.1: The Enlightenment- Definitions The central concern of the Enlightenment was applying rational thought to almost every aspect of human existence: not just science, but philosophy, morality, and society. Along with those philosophical themes, central to the Enlightenment was the emergence of new forms of media and new ways in which people exchanged information, along with new “sensibilities” regarding what was proper and desirable in social conduct and politics. We owe to the Enlightenment fundamental modern beliefs.
• 13.2: Context and Causes One of the major causes of the Enlightenment was the Scientific Revolution. It cannot be overstated how important the work of scientists was to the thinkers of the Enlightenment, because works like Newton's Mathematical Principles demonstrated the existence of eternal, immutable laws of nature that were completely rational and understandable by humans. Indeed, in many ways the Enlightenment begins with Newton's publication of the Principles in 1687.
• 13.3: Enlightenment Philosophes The term most often used for Enlightenment thinkers is philosophe, meaning simply "philosopher" in French. Many of the most famous and important philosophes were indeed French, but there were major English, Scottish, and Prussian figures as well. Some of the most noteworthy philosophes included the following.
• 13.4: Politics and Society Philosophes tended to openly attack the most egregious injustices they perceived in royal governments and the organized churches, but at the same time their skepticism about the intellectual abilities of the common people was such that almost none of them advocated a political system besides a better, more rational version of monarchy. Likewise, philosophes were quick to salute monarchs who they thought were living up to their hopes for the ideal of rational monarchy.
• 13.5: The Radical Enlightenment and the Underground The so-called Radical Enlightenment (the term was invented by historians, not people involved in it) had to do with the ideas too scandalous for mainstream philosophes to support, like outright atheism. One examples of this phenomenon was the emergence of Freemasonry, "secret," although not difficult to find for most male European elites, groups of like-minded Enlightenment thinkers who gathered in "lodges" to discuss philosophy, make political connections, and socialize.
• 13.6: Implications of the Enlightement Even though most of the major figures of the Enlightenment were themselves social elites, their thought was ultimately disruptive to the Christian society of orders. Almost all of the philosophes claimed that the legitimacy of a monarch was based on their rule coinciding with the prosperity of the nation and the absence of cruelty and injustice in the laws of the land. The implication was that people have the right to judge the monarch in term of his or her competence and rationality.

Thumbnail: Voltaire, French Enlightenment writer and philosopher (Public Domaon; Maurice Quentin de La Tour, 1735 via Wikipedia).

The Age of Enlightenment: Overview and Analysis Essay

The Enlightenment is the broad term applied to the intellectual developments of the eighteenth century, as articulated by a relatively small number of thinkers and writers primarily in Western Europe. The Age of Enlightenment centered on France and two of the major philosophers who contributed to this age of Enlightenment were Voltaire and Montesquieu. The others were Diderot, Rousseau, Hume, and Kant. Voltaire and Montesquieu were confident that the reforms they suggested were both reasonable and practically feasible (Kagan et al, chapter 18). The concept of deism, for example, allowed thinkers to accept new rationalism without having to deny the existence of God in an outright manner. Voltaire and Montesquieu opposed and rejected the views of the Roman Church which they believed was irrational and oppressive (Fitzpatrick, 83). But these philosophes sought religious toleration concerning all European faiths. The philosophes also affected the areas of justice, economics, and political thought.

The philosophes believed that by obeying rational laws society and human relationships could be improved. This belief was the foundation stone for the subject called ‘social science’. During the Age of Enlightenment, Beccaria proposed reforms in the areas of criminal justice and punishment. In the realm of Economics, Adam Smith’s works questioned the trade practices of the time and laid the foundation for the Industrial Revolution. His 1776 Inquiry into the Nature and Causes of the Wealth of Nations is commonly described as the founding document for laissez-faire (hands-off) economic policy. This work was instrumental in raising a debate over economic progress versus individual well-being in Western society. Many French economic reformers advocated agricultural reform. In the realm of politics, the government was the focus of a lot of investigation and criticism. Enlightenment thinkers did not stop with mere criticism of corruption in the government and church. Montesquieu provided the outline of a system that would create a new balance in governing the state. Montesquieu admired the British constitution and the concept of the aristocracy. He tried to incorporate it in his presentation of the ideal government. Rousseau was a radical, who believed society was more important than the individual because only within a properly functioning society could an individual life a moral life. Overall, many philosophes were fundamentally monarchists, though of course, they believed monarchies should be reformed.

Many revolutionary ideas of the Enlightenment reached Eastern Europe in the form of “Enlightened Absolutism.” The rulers of Prussia, Austria, and Russia tried to follow certain Enlightenment principles. But these rulers could not accept the philosophes’ rejection of war as irrational. Frederick II (the Great) of Prussia, Maria Theresa and her son Joseph II of Austria, and Catherine II (the Great) of Russia implemented some Enlightenment measures but did not create any change to their existing political and social frameworks. Ultimately, the Prussian, Austrian, and Russian empires rejected the Enlightenment ideals towards the end of the century (Kagan et al, chapter 18).

The Age of Enlightenment in England took place through coffeehouses and the newly flourishing press. In Germany, the universities became centers of the Enlightenment. Italian representatives of the age included Cesare Beccaria and Giambattista Vico. From America, Thomas Paine, Thomas Jefferson, and Benjamin Franklin exerted vast international influence (Columbia Encyclopedia, 15622).

Voltaire’s satire, Candide was the most influential work of the period and reflected the philosophe’s concerns and general attitudes. The major works that influenced the Age of Enlightenment were the Newtonian worldview, Locke’s psychology, Britain’s wealth and stability, French reform, and the emerging print culture in Europe. The Encyclopedia compiled by Denis Diderot and Jean le Rond d’Alembert and completed in 1772 contained the views of most of France’s leading philosophes on various subjects. The Encyclopedia helped in spreading Enlightenment ideas throughout Europe.

There were many weak points in the philosophes as well. The four-stage theory of social development proved detrimental to the relationships between the West and other cultures. The philosophes failed to address reforms to help women and had a strong tendency to equate “human” with “male” (Kagan et al, chapter 18). Many philosophes including the radical Rousseau held traditional ideas about gender roles and believed that women were physiologically inferior to men and that women should be restricted only within the domestic sphere. However, late in the 18th century, Mary Wollstonecraft’s A Vindication of the Rights of Women placed women’s rights within the Enlightenment agenda (Johnston, page 1).

Bibliography

Kagan, Donald; Ozment, Steven and Turner, M. Frank (1979). The Western Heritage, Eighth Edition. Prentice Hall, Inc. New Jersey.

Johnston, Ian (2000). Lecture on Mary Wollstonecraft’s Vindication of the Rights of Woman .

The Columbia Encyclopedia (2004). Enlightenment. Sixth Edition. Columbia University Press. New York.

Fitzpatrick, Martin; Jones, Peter; Knellwolf, Christa; Mccalman, Iain (2004). The Enlightenment World. Routledge Publishers. New York.

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Home — Essay Samples — Philosophy — Enlightenment — The Age of Enlightenment

The Age of Enlightenment

• Categories: Enlightenment

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Published: Nov 19, 2018

Words: 710 | Pages: 2 | 4 min read

Works Cited

• Appleby, J. H., Hunt, L., & Jacob, M. C. (2017). Telling the truth about history. W. W. Norton & Company.
• Darnton, R. (2018). The business of enlightenment: A publishing history of the Encyclopédie, 1775-1800. Harvard University Press.
• Gay, P. (2019). The Enlightenment: The rise of modern paganism. W. W. Norton & Company.
• Israel, J. I. (2019). Enlightenment contested: Philosophy, modernity, and the emancipation of man, 1670-1752. Oxford University Press.
• Kramnick, I. (Ed.). (1995). The Portable Enlightenment Reader. Penguin Books.
• Outram, D. (2019). The Enlightenment. Cambridge University Press.
• Porter, R. (2001). Enlightenment: Britain and the creation of the modern world. Penguin Books.
• Schmidt, J. D. (2019). The Enlightenment: A sourcebook and reader. Routledge.
• Vovk, Y. (2019). The intellectual origins of the European Enlightenment. Cambridge University Press.
• Zinman, C. (2019). Philosophy, science, and religion in England, 1640-1700. Cambridge University Press.

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Background Essay: The Enlightenment and Social Contract Theory

Guiding Questions: What were the major ideas of the Enlightenment? How did the Enlightenment influence the United States’ Founding?

• I can explain the historical context for the emergence of the Enlightenment.
• I can explain the major ideas of Enlightenment thinkers Thomas Hobbes, John Locke, and Jean-Jacques Rousseau.
• I can compare the influence of Thomas Hobbes, John Locke, and Jean-Jacques Rousseau on the Founders of the United States.

Essential Vocabulary

Directions: As you read the essay, highlight or underline key ideas in the text. Take notes about the main ideas of the essay in the right column.

During the 1500s and 1600s, the Scientific Revolution greatly expanded human understanding of the material world and the frontiers of human knowledge through use of the scientific method and experiments. The Enlightenment , or age of reason, followed in the 1600s and focused on examining human nature and its characteristics, such as forms of government. The Enlightenment ushered in an era of greater questioning of traditional truths and authorities and played an important role in helping shape the American Founders’ thinking.

Many Enlightenment thinkers, including Thomas Hobbes, John Locke, and Jean-Jacques Rousseau, developed ideas about human nature by reflecting on the nature and condition of humans before the existence of government and civil society —the groups of citizens and organizations that make up society and work for the common concerns in a community. Each thinker considered what humans are like in their natural state and explained why they formed organized communities. The philosophers agreed that to do so, humans must make a social contract , or an agreement to live together under certain rules for the common good. However, Enlightenment thinkers disagreed on nearly all of the details.

Thomas Hobbes (1588–1679)

Thomas Hobbes wrote his famous book Leviathan (1658) within the context of the English Civil War , a civil war fought between supporters of the monarchy of Charles I and supporters of Parliament from 1642 to 1651. He believed that human nature was essentially corrupt. He thought that people were naturally ruled by their passions, self-interest, and a desire for power. Without laws or government authority, humans threaten each other’s rights and lives. All are equally endangered. Hobbes argued that this state of nature was a “war of all against all.” Since no one was safe in the state of nature, it was reasonable for humans to form a social contract with each other to create a government. Hobbes’s social contract philosophy represents a break from the ancient and medieval belief that humanity was naturally social. The older view was that social and political institutions arose naturally, not from a contract between individuals.

In the social contract, individuals agreed to form a political society based on certain conditions, including that the people surrendered many of their rights to a sovereign leader—one with legitimate authority—to protect their lives. The sovereign was given the power to enforce the contract. The sovereign was not subject to the contract. The sovereign ruled with unlimited power and had the right to make war and peace, enact taxes, raise an army, prevent negative speech, and punish lawbreakers severely. There was no separation of powers to limit the sovereign’s power. Hobbes thus supported an absolute monarchy , a form of government under which the monarch holds all political power.

According to Hobbes, the main goal of the social contract was to prevent a return to the state of nature and provide order, safety, and security through a strong government. There was no right of rebellion, and subjects had a duty to obey the sovereign’s will. The Founders read Hobbes, but few agreed with his conclusions about absolute power.

John Locke (1632–1704)

John Locke was influenced by the outcome of the Glorious Revolution , a revolution in which England overthrew its king, James II, and replaced him with a new monarch with fewer absolute powers. He wrote Second Treatise of Government (1690), in which he developed very different conclusions about human nature than Hobbes. Locke believed that in a state of nature, humans were rational beings and equal in their natural rights to life, liberty, and property, which could not be taken away by anyone without their consent. People also enjoyed perfect freedom restricted only by the moral code of natural law , a system of justice that applies to all humans, and could not violate one another’s rights.

Locke believed individuals claimed ownership of property when they improved it through their labor. They had a right to that property, and it could not be taken away from them without their consent. Even though humans were generally good, occasional disputes occurred over property rights. Therefore, humans agreed to form a social contract with each other to create a civil government and society to settle these disputes. The purpose of the government was to protect the individual rights of the sovereign people and to promote the common good. The powers of government were therefore limited to these activities, rather than extending to providing goods and services for citizens. In addition, the existence of natural rights is itself a limit on government, as the individual has rights that government itself must respect. Government power was further restricted by a separation of powers between the branches of government. Locke consistently defended limited government, in contrast to Hobbes’s absolutism, or unlimited governmental power.

According to Locke, the people are the final check on tyrannical , or oppressive, government. If a government acted tyrannically and violated rights, the people had the right to rebel. They could alter or abolish the government but only after a long history of abuses. The people would then agree to a new social contract to create a new form of government that was better able to protect their rights.

Locke’s influence on the natural rights philosophy and principle of self-government in the Declaration of Independence is unmistakable.

Jean-Jacques Rousseau (1712–1778)

Jean-Jacques Rousseau was a French Enlightenment thinker who lived and wrote after Hobbes and Locke. He focused on social contract theory, most notably in his book The Social Contract (1762). Rousseau developed views about human nature and government that were radically different from those of Hobbes and Locke.

Rousseau opened his book with the provocative phrase “Man is born free, and everywhere he is in chains.” What he meant by this is that humans are naturally good and even perfectible in a state of nature. They are innately, or naturally, good, virtuous, equal, and free.

Rousseau further argued that the institutions of society (family, church, education, government, and civil groups) actually corrupted and enslaved individuals rather than teaching them civic virtues. The creation and ownership of private property created inequalities, and wealth created vanity and corruption. Rousseau believed that society robbed humans of their natural freedom. His view of the social contract and government was based upon this view of human nature and society.

Rousseau believed that all individuals surrendered their rights and property to the community. Since humans were rational and perfectible beings, they would all agree on good laws. This collective consensus (meaning all agree, rather than just a majority) was called the “General Will” and was the only source of law.

In Rousseau’s view, all citizens were legislators and participated in government. If the country became too large and needed representatives, these officials were required to consult the General Will in making laws rather than their own judgments. Since the people were free, reasonable, and equal, there was no need for a separation of powers among three branches or a division of power of any kind.

Rousseau’s ideas influenced the French Revolution and were found in the Declaration of the Rights of Man and of the Citizen of 1789. This document, which sought to list the rights of the citizens of France, stated that sovereignty was found in the collective will of the nation. In the American Declaration of Independence, sovereignty is found in the people. Rousseau’s influence on the Founders was limited.

In Conclusion

The different strains of Enlightenment thought helped shape the political philosophy of the modern world. The American republic was most heavily influenced by the Enlightenment ideas of John Locke, along with classical thought, Protestant Christianity, English tradition, and colonial experience. Part of the genius of the Founding generation was in their combination of these various intellectual streams, taking the best of each tradition and building a “new order for the ages.”

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Why the World Still Needs Immanuel Kant

Unlike in Europe, few in the United States will be celebrating the philosopher’s 300th birthday. But Kant’s writing shows that a free, just and moral life is possible — and that’s relevant everywhere.

Credit... Illustration by Daniel Barreto

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By Susan Neiman

The philosopher Susan Neiman is the director of the Einstein Forum in Potsdam, Germany.

• Published April 17, 2024 Updated April 18, 2024

When I arrived in Berlin in 1982, I was writing a dissertation on Kant’s conception of reason. It was thrilling to learn that the apartment I’d sublet turned out to be located near Kantstrasse, though at the time I wondered in frustration: Why was there no James Street — Henry or William — in the Cambridge, Mass., I’d left behind; no streets honoring Emerson or Eliot? Were Americans as indifferent to culture as snooty Europeans supposed? It didn’t take long before I, too, could walk down Kantstrasse and turn right on Leibniz without a thought.

It’s harder to ignore the way Germany, like other European nations, sets aside entire years to honor its cultural heroes. This century has already seen an Einstein Year , a Beethoven Year , a Luther Year and a Marx Year , each commemorating some round-numbered anniversary of the hero in question. Federal and local governments provide considerable sums for events that celebrate the thinkers in question and debate their contemporary relevance.

Years before Immanuel Kant’s 300th birthday on April 22, 2024, the Academy of Science in Berlin, to which he once belonged, organized a conference to begin preparations for his tercentennial. A second conference published a report of the proceedings, but when I urged colleagues to use the occasion to create programs for a wider audience, I was met with puzzled silence. Reaching a wider audience is not a talent philosophy professors normally cultivate, but conversations with other cultural institutions showed this case to be especially thorny.

It wasn’t just uneasiness about celebrating “another dead white man,” as one museum director put it. The problems became deeper as the zeitgeist changed. “ Immanuel Kant: A European Thinker ” was a good title for that conference report in 2019, when Brexit seemed to threaten the ideal of European unification Germans supported. Just a few years later, “European” has become a slur. At a time when the Enlightenment is regularly derided as a Eurocentric movement designed to support colonialism, who feels comfortable throwing a yearlong birthday party for its greatest thinker?

Nonetheless, this year’s ceremonies will officially commence on April 22 with a speech by Chancellor Scholz and a memorial lunch that has taken place on the philosopher’s birthday every year since 1805. Two days earlier, President Frank-Walter Steinmeier of Germany will open an exhibit at the presidential palace devoted to Kant’s writing on peace.

The start of the year saw special Kant editions of four prominent German magazines. A Kant movie made for television premiered on March 1, and another is in production. Four exhibits on Kant and the Enlightenment will open in Bonn, Lüneburg, Potsdam and Berlin. The conferences will be numerous, including one organized by the Divan, Berlin’s house for Arab culture.

But why celebrate the Kant year at all?

The philosopher’s occasional autobiographical remarks provide a clue to the answer. As the son of a saddle maker, Kant would have led a workman’s life himself, had a pastor not suggested the bright lad deserved some higher education. He came to love his studies and to “despise the common people who knew nothing,” until “Rousseau set me right,” he wrote. Kant rejected his earlier elitism and declared his philosophy would restore the rights of humanity — otherwise they would be more useless than the work of a common laborer.

Chutzpah indeed. The claim becomes even more astonishing if you read a random page of his texts. How on earth, you may ask, are human rights connected with proving our need to think in categories like “cause” or “substance?” The question is seldom raised, and the autobiographical remarks usually ignored, for traditional readings of Kant focus on his epistemology, or theory of knowledge.

Before Kant, it’s said, philosophers were divided between Rationalists and Empiricists, who were concerned about the sources of knowledge. Does it come from our senses, or our reason? Can we ever know if anything is real? By showing that knowledge requires sensory experience as well as reason, we’re told, Kant refuted the skeptics’ worry that we never know if anything exists at all.

All this is true, but it hardly explains why the poet Heinrich Heine found Kant more ruthlessly revolutionary than Robespierre. Nor does it explain why Kant himself said only pedants care about that kind of skepticism. Ordinary people do not fret over the reality of tables or chairs or billiard balls. They do, however, wonder if ideas like freedom and justice are merely fantasies. Kant’s main goal was to show they are not.

The point is often missed, because Kant was as bad a writer as he was a great philosopher. By the time he finishes proving the existence of the objects of ordinary experience and is ready to show how they differ from ideas of reason, the semester is nearly over. Long-windedness is not, however, the only reason his work is often misinterpreted. Consider the effects of a bad review.

Had Kant died before his 57th birthday, he’d be remembered by a few scholars for some short, early texts. He withdrew from writing them in 1770 to conceive and compose his great “Critique of Pure Reason .” After what scholars call his “silent decade,” Kant pulled the text together in six months and finally published in 1781. For a year and a half, Kant waited for responses. When one finally appeared, it was a hatchet job accusing him of being a Berkeleyan solipsist: someone who denies the existence of ordinary objects.

Any author can imagine Kant’s dismay, and most likely his rage. In haste to refute the distortion of his life’s work, Kant wrote a second edition of the “Critique of Pure Reason,” and more fatefully, the “Prolegomena .” Since the latter is much shorter than the main book, it’s read far more often, and this has skewed the interpretation of Kant’s work as a whole. If the major problem of philosophy were proving the world’s existence, then Kant surely solved it. (Richard Rorty argued that he did, and that philosophy has little more to offer.)

In fact Kant was driven by a question that still plagues us: Are ideas like freedom and justice utopian daydreams, or are they more substantial? Their reality can’t be proven like that of material objects, for those ideas make entirely different claims on us — and some people are completely impervious to their claims. Could philosophy show that acting morally, if not particularly common, is at least possible?

A stunning thought experiment answers that question in his next book, the “Critique of Practical Reason .” Kant asks us to imagine a man who says temptation overwhelms him whenever he passes “a certain house.” (The 18th century was discreet.) But if a gallows were constructed to insure the fellow would be hanged upon exiting the brothel, he’d discover he can resist temptation very well. All mortal temptations fade in the face of threats to life itself.

Yet the same man would hesitate if asked to condemn an innocent man to death, even if a tyrant threatened to execute him instead. Kant always emphasized the limits of our knowledge, and none of us know if we would crumble when faced with death or torture. Most of us probably would. But all of us know what we should do in such a case, and we know that we could .

This experiment shows we are radically free. Not pleasure but justice can move human beings to deeds that overcome the deepest of animal desires, the love of life. We want to determine the world, not only to be determined by it. We are born and we die as part of nature, but we feel most alive when we go beyond it: To be human is to refuse to accept the world we are given.

At the heart of Kant’s metaphysics stands the difference between the way the world is and the way the world ought to be. His thought experiment is an answer to those who argue that we are helpless in the face of pleasure and can be satisfied with bread and circuses — or artisanal chocolate and the latest iPhone. If that were true, benevolent despotism would be the best form of government.

But if we long, in our best moments, for the dignity of freedom and justice, Kant’s example has political consequences. It’s no surprise he thought the French Revolution confirmed our hopes for moral progress — unlike the followers of his predecessor David Hume, who thought it was dangerous to stray from tradition and habit.

This provides an answer to contemporary critics whose reading of Kant’s work focuses on the ways in which it violates our understanding of racism and sexism. Some of his remarks are undeniably offensive to 21st-century ears. But it’s fatal to forget that his work gave us the tools to fight racism and sexism, by providing the metaphysical basis of every claim to human rights.

Kant argued that each human being must be treated as an end and not as a means — which is why he called colonialism “evil” and congratulated the Chinese and Japanese for denying entry to European invaders. Contemporary dismissals of Enlightenment thinkers forget that those thinkers invented the concept of Eurocentrism, and urged their readers to consider the world from non-European perspectives. Montesquieu put his criticisms of French society in the mouths of fictitious Persians; Lahontan attacked European politics through dialogues with a Native American.

At a time when the advice to “be realistic” is best translated as the advice to decrease your expectations, Kant’s work asks deep questions about what reality is. He insisted that when we think morally, we should abstract from the cultural differences that divide us and recognize the potential human dignity in every human being. This requires the use of our reason. Contrary to trendy views that see reason as an instrument of domination, Kant saw reason’s potential as a tool for liberation.

He also argued that political and social relations must aim toward justice rather than power, however often those may be confused in practice. We’ve come to better understand how racism and sexism can preclude genuine universalism. Should we discard Kant’s commitment to universalism because he did not fully realize it himself — or rather celebrate the fact that we can make moral progress, an idea which Kant would wholeheartedly applaud?

In Germany, it’s now common to hear that the Enlightenment was at very best ambivalent: While it may have been an age of reason, it was also an age of slavery and colonialism. This argument ignores the fact that, like progressive intellectuals everywhere, Enlightenment thinkers did not win all their battles. It also neglects the fact that they fought for them anyway, despite the risks of censorship, exile and even death.

Significantly, many contemporary intellectuals from formerly colonized countries reject those arguments. Thinkers like the Ghanaian Ato Sekyi-Otu, the Nigerian Olufemi Taiwo, the Chilean Carlos Peña, the Brazilian Francisco Bosco or the Indian Benjamin Zachariah are hardly inclined to renounce Enlightenment ideas as Eurocentric.

The problem with ideas like universal human rights is not that they come from Europe, but that they were not realized outside of it. Perhaps we should take a lesson from the Enlightenment and listen to non-Western standpoints?

Arts and Culture Across Europe

Our theater critics and a reporter discuss the big winne r —  Andrew Lloyd Webber’s “Sunset Boulevard” — and the rest of the honorees at this year’s Olivier Awards .

New productions of “Macbeth” and “Hamlet” in Paris follow a French tradition of adapting familiar works . The results are innovative, and sometimes cryptic.

The internet latched on to 16-year-old Felicia Dawkins’ performance as The Unknown at a shambolic Willy Wonka-inspired event . Now she’s heading to a bigger and scarier stage in London.

When activists urged Tate Britain in London to take an offensive artwork off its walls, the institution commissioned Keith Piper  to create a response instead. The result recently went on display.

The new National Holocaust Museum in Amsterdam has been in the works for almost 20 years. It is the first institution to tell the full story  of the persecution of Dutch Jews during World War II.

At a retrospective of John Singer Sargent’s portraits in London, where the American expatriate fled after creating a scandal in Paris, clothes offer both armor and self-expression .

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