The work that more than any other popularized the optimistic philosophy, not only in England but throughout Europe, was Alexander Pope's Essay on Man (1733-34), a rationalistic effort to justify the ways of God to man philosophically. As has been stated in the introduction, Voltaire had become well acquainted with the English poet during his stay of more than two years in England, and the two had corresponded with each other with a fair degree of regularity when Voltaire returned to the Continent.

Voltaire could have been called a fervent admirer of Pope. He hailed the Essay of Criticism as superior to Horace, and he described the Rape of the Lock as better than Lutrin. When the Essay on Man was published, Voltaire sent a copy to the Norman abbot Du Resnol and may possibly have helped the abbot prepare the first French translation, which was so well received. The very title of his Discours en vers sur l'homme (1738) indicates the extent Voltaire was influenced by Pope. It has been pointed out that at times, he does little more than echo the same thoughts expressed by the English poet. Even as late as 1756, the year in which he published his poem on the destruction of Lisbon, he lauded the author of Essay on Man. In the edition of Lettres philosophiques published in that year, he wrote: "The Essay on Man appears to me to be the most beautiful didactic poem, the most useful, the most sublime that has ever been composed in any language." Perhaps this is no more than another illustration of how Voltaire could vacillate in his attitude as he struggled with the problems posed by the optimistic philosophy in its relation to actual experience. For in the Lisbon poem and in Candide, he picked up Pope's recurring phrase "Whatever is, is right" and made mockery of it: "Tout est bien" in a world filled with misery!

Pope denied that he was indebted to Leibnitz for the ideas that inform his poem, and his word may be accepted. Those ideas were first set forth in England by...