John Chrysostom — as excerpted in the Catena Aurea on John 3:27-30

“(Hom. xxix. 2) John, on this question being raised, does not rebuke his disciples, for fear they might separate, and turn to some other school, but replies gently, John answered and said, A man can receive nothing, except it be given him from heaven; as if he said, No wonder that Christ does such excellent works, and that all men come to Him; when He Who doeth it all is God. Human efforts are easily seen through, are feeble, and short-lived. These are not such: they are not therefore of human, but of divine originating. He seems however to speak somewhat humblyk of Christ, which will not surprise us, when we consider that it was not fitting to tell the whole truth, to minds prepossessed with such a passion as envy. He only tries for the present to alarm them, by shewing that they are attempting impossible things, and fighting against God.”