Ver. 15. _Let such teach others, &c._] But it is not enough that the critic hath these natural endowments of judgment and taste, to entitle him to exercise his art; he should, as our author shows us, from ver. 14 to 19, in order to give a further test of his qualification, have put them successfully into use. And this on two accounts: 1. Because the office of a critic is an exercise of authority. 2. Because he being naturally as partial to his judgment as the poet is to his wit, his partiality would have nothing to correct it, as that of the person judged hath by the very terms. Therefore some test is necessary; and the best and most unexceptionable, is his having written well himself--an approved remedy against critical partiality, and the surest means of so maturing the judgment as to reap with glory what Longinus calls "the last and most perfect fruits of much study and experience." Η γαρ των λογων κρισις πολλης εστι πειρας τελευταιον επιγεννημα. Ver. 19. _Yet, if we look, &c._] But the author having been thus free with the fundamental quality of criticism, judgment, so as to charge it with inconstancy and partiality, and to be often warped by custom and affection, that he may not be misunderstood, he next explains, from ver. 18 to 36, the nature of judgment, and the accidents occasioning those miscarriages before objected to it. He owns, that the seeds of judgment are indeed sown in the minds of most men, but by ill culture, as it springs up, it generally runs wild, either on the one hand, by false learning, which pedants call philology, and by false reasoning, which philosophers call school-learning, or, on the other, by false wit, which is not regulated by sense, and by false politeness, which is solely regulated by the fashion. Both these sorts, who have their judgment thus doubly depraved, the poet observes, are naturally turned to censure and abuse, only with this difference, that the learned dunce always affects to be on the reasoning, and the unlearned fool on the laughing side. And thus, at the same time, our author proves the truth of his introductory observation, that the number of bad critics is vastly superior to that of bad poets.