He was born in October 1713, in Langres, Haute-Marne, France; and died in Paris July 31st, 1784. After a classical education in Jesuit schools, he utterly disgusted his father by turning to the Bohemian life of a littérateur in Paris. Although very poor, he married at the age of thirty. The whole story of his married life--the common Parisian story in those days--reflects no credit on him; though his _liaison_ with Mademoiselle Voland presents the aspects of a friendship abiding through life. Poverty spurred him to exertion. Four days of work in 1746 are said to have produced 'Pensées Philosophiques' (Philosophic Thoughts). This book, with a little essay following it, 'Interprétation de la Nature,' was his first open attack on revealed religion. Its argument, though only negative, and keeping within the bounds of theism, foretokened a class of utterances which were frequent in Diderot's later years, and whose assurance of his materialistic atheism would be complete had they not been too exclamatory for settled conviction. He contents himself with glorifying the passions, to the annulling of all ethical standards. On this point at least his convictions were stable, for long afterward he writes thus to Mademoiselle Voland:--"The man of mediocre passion lives and dies like the brute.... If we were bound to choose between Racine, a bad husband, a bad father, a false friend, and a sublime poet, and Racine, good father, good husband, good friend, and dull worthy man, I hold to the first. Of Racine the bad man, what remains? Nothing. Of Racine the man of genius? The work is eternal." About 1747 he produced an allegory, 'Promenade du Sceptique.' This French 'Pilgrim's Progress' scoffs at the Church of Rome for denying pleasure, then decries the pleasures of the world, and ends by asserting the hopeless uncertainty of the philosophy which both scoffs at the Church and decries worldly pleasure. At this period he was evidently inclined to an irregular attack on the only forms of Christianity familiar to him, asceticism and pietism.