An Essay on Man is a poem published by Alexander Pope in 1733–1734. It was dedicated to Henry St John, 1st Viscount Bolingbroke, (pronounced 'Bull-en-brook') hence the opening line: "Awake, St John...". It is an effort to rationalize or rather "vindicate the ways of God to man" (l.16), a variation of John Milton's claim in the opening lines of Paradise Lost, that he will "justifie the wayes of God to men" (1.26). It is concerned with the natural order God has decreed for man. Because man cannot know God's purposes, he cannot complain about his position in the great chain of being (ll.33-34) and must accept that "Whatever is, is right" (l.292), a theme that was satirized by Voltaire in Candide (1759). More than any other work, it popularized optimistic philosophy throughout England and the rest of Europe. Pope's Essay on Man and Moral Epistles were designed to be the parts of a system of ethics which he wanted to express in poetry. Moral Epistles has been known under various other names including Ethic Epistles and Moral Essays. On its publication, An Essay on Man received great admiration throughout Europe. Voltaire called it "the most beautiful, the most useful, the most sublime didactic poem ever written in any language". In 1756 Rousseau wrote to Voltaire admiring the poem and saying that it "softens my ills and brings me patience". Kant was fond of the poem and would recite long passages from it to his students. Later however, Voltaire renounced his admiration for Pope's and Leibniz's optimism and even wrote a novel, Candide, as a satire on their philosophy of ethics. Rousseau also critiqued the work, questioning "Pope's uncritical assumption that there must be an unbroken chain of being all the way from inanimate matter up to God." The essay, written in heroic couplets, comprises four epistles. Pope began work on it in 1729, and had finished the first three by 1731. They appeared in early 1733, with the fourth epistle published the following year. The poem was originally published anonymously; Pope did not admit authorship until 1735. Pope reveals in his introductory statement, "The Design", that An Essay on Man was originally conceived as part of a longer philosophical poem which would have been expanded on through four separate books. According to his friend and editor, William Warburton, Pope intended to structure the work as follows: The four epistles which