3 For now let us begin to uncover the hidden meanings of the mysteries, so far as He in whose name we made you the promise may enable us. 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,” says he, “while Moses is read, that same veil is upon their heart; that it is not unveiled because it is done away in Christ.
And when you shall have passed over,” says 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 you have passed over to the Lord, the veil is taken away; so likewise is tastelessness taken away when you have passed over to the Lord; and what was water now becomes wine to you. Read all the prophetic books; and if Christ be not understood therein, what can you find so insipid and silly? Understand Christ in them, and what you read not only has a taste, but even inebriates you; transporting the mind from the body, so that forgetting the things that are past, you reach forth to the things that are before.
Source: Tractates on the Gospel of John (New Advent)