An Essay on Criticism is one of the first major poems written by the English writer Alexander Pope (1688–1744), published in 1711. It is the source of the famous quotations "To err is human; to forgive, divine", "A little learning is a dang'rous thing" (frequently misquoted as "A little knowledge is a dang'rous thing"), and "Fools rush in where angels fear to tread". Composition The first fragmentary drafts of the work were written in Abberley in 1707. It was first published in May 1711. Many of the poem's ideas had existed in prose form since at least 1706. Composed in heroic couplets (pairs of adjacent rhyming lines of iambic pentameter) and written in the Horatian mode of satire, it is a verse essay primarily concerned with how writers and critics behave in the new literary commerce of Pope's contemporary age. The poem covers a range of good criticism and advice, and represents many of the chief literary ideals of Pope's age. Structure and themes The verse "essay" was not an uncommon form in eighteenth-century poetry, deriving ultimately from classical forebears including Horace's Ars Poetica and Lucretius' De rerum natura. Pope contends in the poem's opening couplets that bad criticism does greater harm than bad writing: Pope delineates common faults of poets, e.g., settling for easy and clichéd rhymes: Throughout the poem, Pope refers to ancient writers such as Virgil, Homer, Aristotle, Horace and Longinus. This is a testament to his belief that the "Imitation of the ancients" is the ultimate standard for taste. Pope also says, "True Ease in Writing comes from Art, not Chance,/ As those move easiest who have learn'd to dance" (362–363), meaning poets are made, not born. As is usual in Pope's poems, the Essay concludes with a reference to Pope himself. William Walsh, the last of the critics mentioned, was a mentor and friend of Pope who had died in 1708. Part II of An Essay on Criticism includes a famous couplet: This is in reference to the spring in the Pierian Mountains in Macedonia, sacred to the Muses. The first line of this couplet is often misquoted as "a little knowledge is a dangerous thing". The Essay also gives this famous line (towards the end of Part II): The phrase "fools rush in where angels fear to tread" from Part III (line 625) has become part of the popular lexicon, and has been used