5 “I have run in thirst.” For they were rendering evil things for good things: for them was I thirsting: mine honour they thought to drive back: I was thirsting to bring them over into my body. For in drinking what do we, but send into our members liquor that is without, and suck it into our body? Thus did Moses in that head of the calf. The head of the calf is a great sacrament. For the head of the calf was the body of ungodly men, in the similitude of a calf eating hay, seeking earthly things: because all flesh is hay....And what now is more evident, than that into that City Jerusalem, of which the people Israel was a type, by Baptism men were to be made to pass over?
Therefore in water it was scattered, in order that for drink it might be given. For this even unto the end this man thirsts; he runs and thirsts. For many men He drinks, but never will He be without thirst. For thence is, “I thirst, woman, give Me to drink.” That Samaritan woman at the well found the Lord thirsting, and by Him thirsting she was filled: she first found Him thirsting, in order that He might drink her believing. And when He was on the Cross, “I thirst,” He said, although they gave not to Him that for which He was thirsting.
For for themselves He was thirsting: but they gave vinegar, not new wine, wherewith are filled up the new bottles, but old wine, but old to its loss. For old vinegar also is said of the old men, of whom has been said, “For to them is no changing;” namely, that the Jebusites should be overthrown, and Jerusalem be built.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)