Here again observe, that the “because,” and “spake,” refer not to the cause of their unbelief, but to the event. For it was not “because” Isaiah spake, that they believed not; but because they were not about to believe, that he spake. Why then doth not the Evangelist express it so, instead of making the unbelief proceed from the prophecy, not the prophecy from the unbelief? And farther on he putteth this very thing more positively, saying, “Therefore they could not believe, because that Esaias said.” He desires hence to establish by many proofs the unerring truth of Scripture, and that what Isaiah foretold fell not out otherwise, but as he said. For lest any one should say, “Wherefore did Christ come? Knew he not that they would give no heed to him?” he introduces the Prophets, who knew this also. But He came that they might have no excuse for their sin; for what things the Prophet foretold, he foretold as certainly to be; since if they were not certainly to be, he could not have foretold them; and they were certainly to be, because these men were incurable.