3 When we see, therefore, such deeds wrought by Jesus God, why should we wonder at water being turned into wine by the man Jesus? For He was not made man in such manner that He lost His being God. Man was added to Him, God not lost to Him. This miracle was wrought by the same who made all those things. Let us not therefore wonder that God did it, but love Him because He did it in our midst, and for the purpose of our restoration. For He gives us certain intimations by the very circumstances of the case. I suppose that it was not without cause He came to the marriage. The miracle apart, there lies something mysterious and sacramental in the very fact. Let us knock, that He may open to us, and fill us with the invisible wine: for we were water, and He made us wine, made us wise; for He gave us the wisdom of His faith, while before we were foolish. And it appertains, it may be, to this wisdom, together with the honor of God, and with the praise of His majesty, and with the charity of His most powerful mercy, to understand what was done in this miracle.
Source: Tractates on the Gospel of John (New Advent)