23 So far from these words of Faustus' quotation being proved not to refer to Christ by their occurring among the other curses, these curses cannot be rightly understood except as prophecies of the glory of Christ, in which lies the happiness of man. And what is true of these curses is still more true of this quotation. If it could be said of Moses that his words have a different meaning from what was in his mind, I would rather suppose him to have prophesied without knowing it, than allow that the words, "You shall see your life hanging, and shall not believe your life," are not applicable to Christ.
So the words of Caiaphas had a different meaning from what he intended, when, in his hostility to Christ, he said that it was expedient that one man should die for the people, and that the whole nation should not perish, where the Evangelist added that he said this not of himself, but, since he was high priest, he prophesied. But Moses was not Caiaphas; and therefore when Moses said to the Hebrew people, "You shall see your life hanging, and shall not believe your life," he not only spoke of Christ, as he certainly did, even though he spoke without knowing the meaning of what he said, but he knew that he spoke of Christ.
For he was a most faithful steward of the prophetic mystery, that is, of the priestly unction which gives the knowledge of the name of Christ; and in this mystery even Caiaphas, wicked as he was, was able to prophesy without knowing it. The prophetic unction enabled him to prophesy, though his wicked life prevented him from knowing it. Who then can say that there are no prophecies of Christ in Moses, with whom began that unction to which we owe the knowledge of Christ's name, and by which even Caiaphas, the persecutor of Christ, prophesied of Christ without knowing it?
Source: Reply to Faustus the Manichaean (New Advent)