He is speaking of spiritual drink, as His next words shew: He that believeth on Me, as the Scripture hath said, out of his belly shall flow rivers of living water. But where does the Scripture say this? No where. What then? We should read, He that believeth in Me, as saith the Scripture, putting the stop here; and then, out of his belly shall flow rivers of living water: the meaning being, that that was a right kind of belief, which was formed on the evidence of Scripture, not of miracles. Search the Scriptures, He had said before.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. li. 1