John Chrysostom
Catena Aurea · Johannesevangelium 2
Now when he was in Jerusalem at the passover, in the feast day, many believed in his name, when they saw the miracles which he did. But Jesus did not commit himself unto them, because he knew all men. And needed not that any should testify of man: for he knew what was in man.
(Hom. xxv. 1) Or it means that He did not place confidence in them, as perfect disciples, and did not, as if they were brethren of confirmed faith, commit to them all His doctrines, for He did not attend to their outward words, but entered into their hearts, and well knew how short-lived was their zeal1. Because He knew all men, and needed not that any should testify of man, for He knew what was in man. To know what is in man’s heart, is in the power of God alone, who fashioned the heart. He does not want witnesses, to inform Him of that mind, which was of His own fashioning.