John Chrysostom
What then does John do? Fearing that they might separate even from him and do something still worse, he does not rebuke them sharply.
What does he say? "A man can receive nothing for himself unless it has been given him from heaven."
If here he does not yet speak very loftily about Christ, do not marvel. He could not suddenly, and at the first attempt, teach everything to disciples possessed by such feelings.
He first wishes to strike them with fear and show that in warring against Him they are warring not against someone else, but against God Himself.
Thus, what Gamaliel also said, "You cannot overthrow it. Take care lest you even be found fighting against God," Acts 5:39, John here expresses in a veiled manner.
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By saying that no one can receive anything "unless it has been given him from heaven," he shows that they are striving for the impossible and therefore prove to be fighting against God.
What then? Did not the followers of Theudas take something from themselves? They did, but they were immediately scattered and perished.
The works of Christ are not like this. Thus John also quietly calms them, showing that the One who overshadows their glory is not man, but God.
Therefore, if His works are glorious and all go to Him, one should not marvel. Such are divine works, and He who performs them is God. Otherwise He could never have accomplished such great works.
Human works are easy to grasp and unstable. They are quickly destroyed and perish. But these works are not such, and therefore they are not human.
See how John turns against them the very words, "to whom you have borne witness," which John's disciples thought to use for Christ's humiliation.
After first showing that Christ was not glorified by his testimony, he then stops their mouths in this way: "A man," he says, "can receive nothing for himself unless it has been given him from heaven."
What does this mean? If you fully hold to my testimony and acknowledge it as true, then know that, according to this very testimony, you must prefer not me to Him, but Him to me.
And what did I testify? For this I call you as witnesses.