Romans 2:20

"And art confident that thou thyself." Here again he does not say that thou art "a guide of the blind," but "thou art confident," so thou boastest, he says. So great was the unreasonableness of the Jews. Wherefore he also repeats nearly the very words, which they used in their boastings. See for instance what they say in the Gospels. "Thou wast altogether born in sin, and dost thou teach us?" (John ix. 34.) And all men they utterly looked down upon, to convince them of which, Paul keeps extolling them and lowering the others, that so he may get more hold on them, and make his accusation the weightier. Wherefore he goes on adding the like things, and making more of them by different ways of relating them. For "Thou art confident," he saith, "that thou thyself art a leader of the blind, An instructor of the foolish, a teacher of babes, which hast the form of knowledge and truth, which is in the Law." Here again he says not, in the conscience and in actions and in well-doings, but "in the Law;" and after saying so, he does here also what he did with regard to the Gentiles. For as there he says, "for wherein thou judgest another, thou condemnest thyself," so saith he here also.