John Chrysostom
John had also said this earlier: what He knows, He speaks, "and what He has seen, of that He bears witness; and no one receives His testimony" (Jn 3:32).
Likewise Christ says: "We speak what We know, and bear witness to what We have seen, and you do not receive Our testimony" (Jn 3:11).
He does this to forestall them and to show that their unbelief does not trouble Him. He does not seek glory, and He knows their hidden thoughts, both present and future.
They had heard that they would no longer receive food. Therefore they again began not to believe. To justify their unbelief, they allege that His word is too lofty.
For this reason He says, "You have seen Me, and yet do not believe." On the one hand He points to the miracles, and on the other to the testimonies of the Scriptures.
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"These," He says, "are they which bear witness of Me" (Jn 5:39). Again: "I have come in My Father's name, and you do not receive Me" (Jn 5:43).
Again: "How can you believe, who receive glory from one another?" (Jn 5:44).