John Chrysostom — as excerpted in the Catena Aurea on John 8:28-30

“(Hom. liii. 2) Or, He means it as an answer to those who were constantly saying that He was not from God, and that because He did not keep the sabbath; I do always, He says, do those things that please Him; shewing that the breaking the sabbath even was pleasing to Him. He takes care in every way to shew that He does nothing contrary to the Father. And as this was speaking more after a human fashion, the Evangelist adds, As He spake these words, many believed on Him; as if to say, Do not be disturbed at hearing so humble a speech from Christ; for those who had heard the greatest doctrines from Him, and were not persuaded, were persuaded by these words of humility. These then believed on Him, yet not as they ought; but only out of joy, and approbation of His humble way of speaking. And this the Evangelist shews in his subsequent narration, which relates their unjust proceedings towards Him.”