John 2:6

But observe what Himself saith, "The things which were written in the law, and in the prophets, and in the Psalms concerning me." And we know that the law extends from the time of which we have record, that is, from the beginning of the world: "In the beginning God made the heaven and the earth." Thence down to the time in which we are now living are six ages, this being the sixth, as you have often heard and know. The first age is reckoned from Adam to Noah; the second, from Noah to Abraham; and, as Matthew the evangelist duly follows and distinguishes, the third, from Abraham to David; the fourth, from David to the carrying away into Babylon; the fifth, from the carrying away into Babylon to John the Baptist; the sixth, from John the Baptist to the end of the world. Moreover, God made man after His own image on the sixth day, because in this sixth age is manifested the renewing of our mind through the gospel, after the image of Him who created us; and the water is turned into wine, that we may taste of Christ, now manifested in the law and the prophets. Hence "there were there six water-pots," which He bade be filled with water. Now the six water-pots signify the six ages, which were not without prophecy. And those six periods, divided and separated as it were by joints, would be as empty vessels unless they were filled by Christ. Why did I say, the periods which would run fruitlessly on, unless the Lord Jesus were preached in them? Prophecies are fulfilled, the water-pots are full; but that the water may be turned into wine, Christ must be understood in that whole prophecy.

But what means this: "They contained two or three metretae apiece"? This phrase certainly conveys to us a mysterious meaning. For by "metretae" he means certain measures, as if he should say jars, flasks, or something of that sort. Metreta is the name of a measure, and takes its name from the word "measure." For metron is the Greek word for measure, whence the word "metretae" is derived. "They contained," then, "two or three metretae apiece." What are we to say, brethren? If He had simply said "three apiece," our mind would at once have run to the mystery of the Trinity. And, perhaps, we ought not at once to reject this application of the meaning, because He said, "two or three apiece;" for when the Father and Son are named, the Holy Spirit must necessarily be understood. For the Holy Spirit is not that of the Father only, nor of the Son only, but the Spirit of the Father and of the Son. For it is written, "If any man love the world, the Spirit of the Father is not in him." And again, "Whoso hath not the Spirit of Christ is none of His." The same, then, is the Spirit of the Father and of the Son. Therefore, the Father and the Son being named, the Holy Spirit also is understood, because He is the Spirit of the Father and of the Son. […]

But there is also another meaning that must not be passed over, and which I will declare: let every man choose which he likes best. We keep not back what is suggested to us. For it is the Lord's table, and the minister ought not to defraud the guests, especially when they hunger as you now do, so that your longing is manifest. Prophecy, which is dispensed from the ancient times, has for its object the salvation of all nations. True, Moses was sent to the people of Israel alone, and to that people alone was the law given by him; and the prophets, too, were of that people, and the very distribution of times was marked out according to the same people; whence also the water-pots are said to be "according to the purification of the Jews:" nevertheless, that the prophecy was proclaimed to all other nations also is manifest, forasmuch as Christ was concealed in him in whom all nations are blessed, as it was promised to Abraham by the Lord, saying, "In thy seed shall all nations be blessed." But this was not as yet understood, for as yet the water was not turned into wine. The prophecy therefore was dispensed to all nations. But how do we show that all nations belong to the "two or three metretae apiece"? It was a matter of reckoning, in some measure, that he should say the same water-pots contained "two apiece," which he had said contained "three apiece;" evidently in order to intimate to us a mystery therein. How are there "two metretae apiece"? Circumcision and uncircumcision. Scripture mentions these two classes of people, and leaves out no kind of men, when it says, "Circumcision and uncircumcision;" in these two appellations thou hast all nations: they are the two metretae apiece. […]

(Tr. ix. 5. et sq.) Now if He ordered the water to be poured out, and then introduced the wine from the hidden recesses of creation, He would seem to have rejected the Old Testament. But converting, as He did, the water into wine, He showed us that the Old Testament was from Himself, for it was by His order that the waterpots were filled. But those Scriptures have no meaning, if Christ be not understood there. Now we know from what time the law dates, viz. from the foundation of the world. From that time to this are six ages; the first, reekoning from Adam to Noah; the second, from Noah to Abraham; the third, from Abraham to David; the fourth, from David to the carrying away into Babylon; the fifth, from that time to John the Baptist; the sixth, from John the Baptist to the end of the world. The six waterpots then denote these six ages of prophecy. The prophecies are fulfilled; the waterpots are full. But what is the meaning of their holding two or three firkins apiece? Had He said three only, our minds would have run immediately to the mystery of the Trinity. Nor perhaps can we reject it, even though it is said, two or three: for the Father and the Son being named, the Holy Ghost may be understood by consequence; inasmuch as it is the love between the Father and the Son, which is the Holy Ghost. (c. 17.). Nor should we pass over another interpretation, which makes the two firkins alluded to the two races of men, the Jews and the Greeks; and the three to the three sons of Noah.

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. […]