The poem commences with a discussion of the rules of taste which ought to govern poetry, and which enable a critic to make sound critical judgements. In it Pope comments, too, upon the authority which ought properly to be accorded to the classical authors who dealt with the subject; and concludes (in an apparent attempt to reconcile the opinions of the advocates and opponents of rules) that the rules of the ancients are in fact identical with the rules of Nature: poetry and painting, that is, like religion and morality, actually reflect natural law. The "Essay on Criticism," then, is deliberately ambiguous: Pope seems, on the one hand, to admit that rules are necessary for the production of and criticism of poetry, but he also notes the existence of mysterious, apparently irrational qualities — "Nameless Graces," identified by terms such as "Happiness" and "Lucky Licence" — with which Nature is endowed, and which permit the true poetic genius, possessed of adequate "taste," to appear to transcend those same rules. The critic, of course, if he is to appreciate that genius, must possess similar gifts. True Art, in other words, imitates Nature, and Nature tolerates and indeed encourages felicitous irregularities which are in reality (because Nature and the physical universe are creations of God) aspects of the divine order of things which is eternally beyond human comprehension. Only God, the infinite intellect, the purely rational being, can appreciate the harmony of the universe, but the intelligent and educated critic can appreciate poetic harmonies which echo those in nature. Because his intellect and his reason are limited, however, and because his opinions are inevitably subjective, he finds it helpful or necessary to employ rules which are interpretations of the ancient principles of nature to guide him — though he should never be totally dependent upon them. We should note, in passing, that in "The Essay on Criticism" Pope is frequently concerned with "wit" — the word occurs once, on average, in every sixteen lines of the poem. What does he mean by it?