John 2:8

(Hom. xxii. 2) But why did He not work the miracle before they had filled the waterpots, which would have been much more wonderful; inasmuch as it is one thing to change the quality of some existing substance, another to make it that substance out of nothing? The latter miracle would be the more wonderful, but the former would be the more easy of belief. And this principle often acts as a check, to moderate the greatness of our Lord's miracles: He wishes to make them more credible, therefore He makes them less marvellous; a refutation this of the perverse doctrine of some, that He was a different Being from the Maker of the world. For we see He performs most of His miracles upon subject-matter already existing, whereas were He contrary to the Creator of the world, He would not use a material thus alien, to demonstrate His own power. He did not draw out the water Himself which He made wine, but ordered the servants to do so. This was for the sake of having witnesses of the miracle; And He saith unto them, Draw out now, and bear unto the governor of the feast.

In the ancient times there was prophecy, and no times were left without the dispensation of prophecy. But the prophecy, since Christ was not understood therein, was water. For in water wine is in some manner latent. The apostle tells us what we are to understand by this water: "Even unto this day," saith he, "whilst Moses is read, that same veil is upon their heart; that it is not unveiled because it is done away in Christ. And when thou shalt have passed over," saith he, "to the Lord, the veil shall be taken away." By the veil he means the covering over of prophecy, so that it was not understood. When thou hast passed over to the Lord, the veil is taken away; so likewise is tastelessness taken away when thou hast passed over to the Lord; and what was water now becomes wine to thee. Read all the prophetic books; and if Christ be not understood therein, what canst thou find so insipid and silly? Understand Christ in them, and what thou readest not only has a taste, but even inebriates thee; transporting the mind from the body, so that forgetting the things that are past, thou reachest forth to the things that are before. Wherefore, prophecy from ancient times, even from the time when the series of human births began to run onwards, was not silent concerning Christ; but the import of the prophecy was concealed therein, for as yet it was water. When these words of the Gospel are understood, and they are certainly clear, all the mysteries which are latent in this miracle of the Lord will be laid open. Observe what He says, that it behoved the things to be fulfilled in Christ that were written of Him. Where were they written? "In the law," saith He, "and in the prophets, and in the Psalms." He omitted no part of the Old Scriptures. These were water; and hence the disciples were called irrational by the Lord, because as yet they tasted to them as water, not as wine. And how did He make of the water wine? When He opened their understanding, and expounded to them the Scriptures, beginning from Moses, through all the prophets; with which being now inebriated, they said, "Did not our hearts burn within us in the way, when He opened to us the Scriptures?" For they understood Christ in those books in which they knew Him not before. Thus our Lord Jesus Christ changed the water into wine, and that has now taste which before had not, that now inebriates which before did not. For if He had commanded the water to be poured out of the water-pots, and so Himself had put in the wine from the secret repositories of the creature, whence He made bread when He satisfied so many thousands; for five loaves were not in themselves sufficient to satisfy five thousand men, nor even to fill twelve baskets, but the omnipotence of the Lord was, as it were, a fountain of bread; so likewise He might, on the water being poured out, have poured in wine: but had He done this, He would appear to have rejected the Old Scriptures. When, however, He turns the water itself into wine, He shows us that the Old Scripture also is from Himself, for at His own command were the water-pots filled. It is from the Lord, indeed, that the Old Scripture also is; but it has no taste unless Christ is understood therein.