While, therefore, these things now shine forth as clearly as they were loftily foretold, still some one may not vainly be moved to ask, How can we be confident that all things are to come to pass which are predicted in these books as about to come, if this very thing which is there divinely spoken, "Thine house and thy father's house shall walk before me for ever," could not have effect? For we see that priesthood has been changed; and there can be no hope that what was promised to that house may some time be fulfilled, because that which succeeds on its being rejected and changed is rather predicted as eternal. He who says this does not yet understand, or does not recollect, that this very priesthood after the order of Aaron was appointed as the shadow of a future eternal priesthood; and therefore, when eternity is promised to it, it is not promised to the mere shadow and figure, but to what is shadowed forth and prefigured by it. But lest it should be thought the shadow itself was to remain, therefore its mutation also behoved to be foretold.