Denis Diderot

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Article abstract: As editor of and contributor to the Encyclopedia, Diderot codified and promulgated the views of the French Enlightenment. His posthumously published fiction has earned for him a prominent place in the pantheon of eighteenth century writers, and his philosophical works remain challenging and influential.

Early Life

The son of Didier and Angélique Vigneron Diderot, Denis Diderot was born on October 5, 1713, in Langres, France. Although the family was involved in trade—Didier Diderot was a master cutler and his wife the daughter of a tanner—a number of relatives had entered the Church, among them the canon of the cathedral at Langres. Diderot’s brother, Didier-Pierre, and his sister, Angélique, would follow this ecclesiastical path, the former becoming a priest and the latter a nun. Diderot, despite his later atheism, also showed an early inclination in this direction. Tonsured at the age of twelve, he made the one-hundred-fifty-mile journey north to Paris three years later to study at the Jesuit Collège de Louis-le-Grand or the Jansenist Collège d’Harcourt; he may have taken courses at both. When he received his degree in 1732, though, it was from the University of Paris, and his interest had shifted to philosophy and rhetoric.

Since Diderot had abandoned a career in the Church, his father apprenticed him to the Parisian lawyer Clément de Ris. This field suited him no better than religion, and, after enduring two years of legal studies, Diderot turned to a life of letters. His father refused to approve of so uncertain a course, so for the next decade Diderot survived on the meager earnings he garnered as tutor and hack writer, supplemented by occasional small sums from his mother. On November 6, 1743, he married Anne-Toinette Champion, the daughter of a poor linen-shop owner; this step further alienated his father, who so opposed the match that he had Diderot locked up in a monastery to prevent the wedding. Diderot escaped; he realized, however, that he could not rely on his parents to support his family and recognized that he needed a secure source of income.

Life’s Work

Diderot therefore turned to the booksellers, offering his fluency in English and his literary talent. In 1743 he translated Temple Stanyan’s Grecian History (1707) for the publisher Briasson, who was sufficiently pleased with the result to ask Diderot for a French version of Robert James’s Medical Dictionary (1743-1745). At the same time that he was translating James’s treatise, he was adapting the third Earl of Shaftesbury’s An Inquiry Concerning Virtue in Two Discourses (1699). Much in Shaftesbury’s work appealed to Diderot and deeply influenced his views. He admired the Englishman’s tolerance and emphasis on reason, and he adopted the notion that religion and morality should be judged according to their social effects. Diderot also agreed with Shaftesbury that emotions play an important role in fostering socially proper conduct. He was less prepared to accept Shaftesbury’s optimism, his notion of an innate aesthetic appreciation, and his criticism of organized religion.

Diderot’s first original philosophical work, Pensées philosophiques (1746; English translation, 1819), written over Easter weekend, 1746, to earn fifty gold pieces for Madame de Puissieux, his mistress, built on this adaptation. Diderot was still not prepared to reject the Church—the fifty-first pensée reaffirms his belief in Catholicism—but he does urge that faith be tested by reason and that the passions, deemed by the orthodox to be dangerous, be seen as necessary to morality and creativity. Published anonymously, it was sufficiently impressive to be attributed to such well-known intellectuals as Voltaire or étienne Bonnot de Condillac. It was also regarded as sufficiently radical to be condemned...

(This entire section contains 2376 words.)

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by the Parliament of Paris in July, 1746.

La Promenade du sceptique (1830) revealed Diderot’s increasing doubts about religion; the manuscript was seized before publication, and the police began to watch Diderot closely. His bawdy satire on Louis XV and Madame de Pompadour, Les Bijoux indiscrets (1748; The Indiscreet Toys, 1749), further antagonized the authorities, and his Lettre sur les aveugles à l’usage de ceux qui voient (1749; An Essay on Blindness, 1750), which questioned the Deistic argument that cosmic order proves God’s existence, led to his arrest and solitary confinement for three months in the fortress of Vincennes.

This experience shook him deeply. Previously he had published his controversial works anonymously; henceforth, he would rarely publish them at all. His reputation in the eighteenth century, therefore, was lower than it would become after his death. Much of his contemporary acclaim derived from the project that would occupy him for the next fifteen years, the Encyclopédie: Ou, Dictionnaire raisonné des sciences, des arts, et des métiers (1751-1772;Encyclopedia, 1965). His translations and other writings not only had exposed Diderot to new knowledge but also had made him a logical choice for coeditor, with Jean Le Rond d’Alembert, of the ambitious project to translate and supplement Ephraim Chambers’ five-volume Cyclopaedia: Or, Universal Dictionary of the Arts and Sciences (1728).

As conservative opponents, who twice succeeded in having the Encyclopedia condemned, realized, the work was not an innocent compilation of existing knowledge. In its pages nature replaced providence, determinism superseded God’s will as the guiding forces of the world. Instead of relying on authority and tradition, Diderot and his fellow philosophers urged readers to judge by experience and experimentation. In a world of monarchies, the article “Political Authority” proclaimed that “no man has received from nature the right to command other men. Freedom is a present from heaven, and every individual of the same species has the right to enjoy it as soon as he enjoys reason.” By 1758, d’Alembert was sufficiently frightened by official reaction to resign as coeditor, leaving Diderot with the responsibility of writing and soliciting contributions to complete the seventeen volumes of text and twelve of plates.

In the midst of these labors, Diderot found time to produce a number of other works. The theater had long interested him. Late in life he would state that he had debated between studying at the Sorbonne and becoming an actor, and in his Lettre sur les sourds et muets (1751; Letter on the Deaf and Dumb, 1916) he claimed to know much of French drama by heart. In the latter half of the 1750’s he indulged this interest by writing two plays, Le Fils naturel (1757; Dorval: Or, The Test of Virtue, 1767) and Le Père de famille (1758; The Father of the Family, 1770). As the subtitle of Dorval reveals, Diderot regarded these works, as he saw all of his writings, as having a moral purpose. In an article in Encyclopedia, he had spoken of actors’ ability to engender in audiences the love of virtue, and an essay on Geneva, also in the Encyclopedia, by d’Alembert urged the city to permit dramatic productions because they promote morality.

In addition to reforming society, Diderot hoped that his plays would alter theatrical techniques and practices, which he regarded as unrealistic. To the published version of each play he added comments on stagecraft, urging actors to pretend that no audience faced them. He wanted the people onstage to interact naturally with one another, not perform for observers. Diderot also argues, in Le Paradoxe sur le comédien (1830; The Paradox of Acting, 1883), that the actor must be ruled by the intellect rather than by his emotions if he wishes to convey passion consistently. This view incidentally suggests that Diderot was beginning to question his earlier agreement with Shaftesbury on the primacy of sentiment in guiding action.

Questioning does not, however, mean rejecting. As he matured, Diderot would become increasingly skeptical—of his own views as well as others’—stating that “scepticism is the first step towards the truth.” In Le Neveu de Rameau (1821; Rameau’s Nephew, 1897), he seems to prefer Apollonian reason to Dionysian passion, but he also acknowledges the necessity of emotion for creativity. This same ambivalence shows itself in the aesthetic criticism that he wrote for Friedrich Melchior Grimm’s Correspondance littéraire (1845-1857), a newsletter that circulated in manuscript, from 1759 to 1781. In an essay from 1766 on painting, he instructed the artist, “Move me, astonish me, rend me; make me shudder, weep, tremble; fill me with indignation.” At the same time, he recognized that reason must balance enthusiasm.

Though uncertain about the means by which art should achieve its effects, Diderot had no doubt that its end must be the promotion of virtue. Hence, he preferred the sentimental paintings of Jean-Baptiste Greuze to the more sensuous works of François Boucher. Greuze appealed to the heart, Boucher only to the eye. Similarly, though he was an atheist, he admired religious art because it inspired virtuous feelings.

By the time his work on the Encyclopedia ended in 1765, Diderot had gained the reputation of being an important French intellectual. A flattering sign of Diderot’s growing reputation came from Jean-Honoré Fragonard and Catherine the Great of Russia. In his series of paintings honoring the various arts, Fragonard chose Diderot to represent literature. His hair short, his forehead high, his mouth turned up in an enigmatic smile of reason, the philosopher holds a volume of the Encyclopedia and appears to be a Roman citizen wearing an eighteenth century dressing gown. Catherine the Great relieved Diderot of financial concerns in 1765 by buying his library for fifteen thousand livres and appointing him curator for life at a salary of another one thousand livres a year. She agreed not to take formal possession until after Diderot’s death.

In 1773, Diderot went to Russia to thank the empress for her patronage. The trip inspired a number of works reflecting on politics and education, and during this time Diderot probably completed his best-known novel, Jacques le fataliste et son maître (1796; Jacques the Fatalist and His Master, 1797). A clever picaresque, it once more reveals Diderot’s skepticism. Although he had, like Jacques, believed in determinism earlier in his life, he now questions this view. Despite Jacques’s claim that no one has free will, he behaves as if he can choose whatever course of action he wishes to pursue, and the authorial intrusions indicate that chance rules the world. Readers may draw their own conclusions—or conclude nothing.

Similar doubts characterize other writings of this period. “Beware of those who impose order,” he warned in the Supplément au voyage de Bougainville (1796; Supplement to Bougainville’s “Voyage,” 1956). The dialogue form, which Diderot used repeatedly, allows for the presentation of various positions without requiring the author to endorse any. This method, drawn from Plato, appealed to Diderot because it was safe should authorities secure a copy of the manuscript, and it also permitted Diderot to explore various viewpoints. Est-il bon? Est-il méchant? (1781), his last and best play, questions, without deciding, whether one can be virtuous if one performs good deeds in a manner that embarrasses the beneficiaries. Skeptical to the end, Diderot’s last words to his daughter were, “the first step towards philosophy is disbelief.”


Since his death on July 31, 1784, Denis Diderot’s reputation has grown. With the benefit of the perspective brought by time, one can recognize the truth of Carl Becker’s observation that Diderot epitomized his age, both in the profundity of his thought and in the occasional shallowness of his observations. One can appreciate more fully his courage in speaking out, guiding the Encyclopedia to completion despite an official ban, telling Catherine the Great that she should abandon autocracy for democracy, and the like. One of his essays was sufficiently bold in its criticism of the ancien régime to earn for him a severe reprimand from the police commissioner of Paris. With the publication of many of his best works, one can at last see his greatness as a writer as well as a thinker.

Even more important to the increasing appreciation of Diderot is the fact that his empiricism and skepticism match the modern mood. In his own day Voltaire referred to him as Socrates, a title that fits well. Like Socrates, Diderot questioned the accepted wisdom of his day, risked much for his beliefs, and contributed to the intellectual progress of his age. Writing of eccentrics, Diderot remarked, “If one of them appears in company, he is like a piece of yeast which ferments and restores to everyone a portion of his natural liberty. He shakes and stirs things up; he calls forth praise and blame; he brings out the truth.” In these lines from Rameau’s Nephew Diderot wrote his own epitaph.


Blum, Carol. Diderot: The Virtue of a Philosopher. New York: Viking Press, 1974. Focuses on Diderot’s concern for a moral life and his intellectual quest to define what such an existence involves. A well-written study that draws on biography, letters, and published writings. Makes some useful comparisons between Diderot and Rousseau on the nature of virtue.

Darnton, Robert. The Business of Enlightenment: A Publishing History of the “Encyclopédie,” 1775-1800. Cambridge, Mass.: Harvard University Press, 1979. This massive, prizewinning history of Diderot’s great project is an important contribution to the growing number of studies devoted to publishing, bookselling, the reading public, and similar topics—placing ideas in the context in which they are disseminated. Illustrated, with a narrative bibliography and an index.

Fellows, Otis. Diderot. Boston: Twayne, 1977. A chronological overview touching briefly on almost all Diderot’s works. Stresses Diderot’s modernity and traces the evolution of his thought. A helpful, annotated bibliography concludes the work.

France, Peter. Diderot. New York: Oxford University Press, 1983. A good, short introduction concentrating on Diderot’s ideas. Arranged topically rather than chronologically, covering Diderot’s political, social, and aesthetic views. Includes a useful bibliography with brief annotations.

Undank, Jack, and Herbert Josephs, eds. Diderot: Digression and Dispersion, a Bicentennial Tribute. Lexington, Ky.: French Forum, 1984. Presents nineteen essays that cover Diderot’s many activities and interests. In their diversity the contributions mirror the editors’ view that Diderot did not seek unity but rather regarded diversity as the rule of nature.

Wilson, Arthur M. Diderot. New York: Oxford University Press, 1972. The definitive biography. Places Diderot within the context of the Enlightenment and emphasizes his courage in remaining as editor of the Encyclopedia. Considers the development of Diderot’s ideas on such matters as religion, emotion and reason, order and diversity, determinism and chance.