Such is the prophecy. But the opening of the prophecy (c) is worthy of our study, which bears witness to those that read it, "If ye do not believe, neither will ye understand." And it is above all necessary to note that the words shew that its readers need not only intellect but faith, and not only faith but intellect. Hence the Jews who do not believe in Christ, though they are even now hearers of these words, have not even yet understood Him of Whom the prophecy was given, so that in their case the prediction has its primary fulfilment. For though they hear daily with their ears the prophecies about Christ, they hear them not (d) with the ears of their mind. And the sole cause of their ignorance is unbelief, as the prophecy truly reveals of them and to them. For it says, "If ye will not believe, neither shall ye understand."