John Chrysostom
"For who makes you differ? And what do you have that you did not receive?" (1 Cor 4:7). Here, leaving the subordinates, he turns to the leaders. The meaning of his words is this: how is it known that you are worthy of praise? Was there a judgment? Was there an examination, investigation, and exact inquiry? You cannot say this. If men have judged so, the judgment is not reliable.
Suppose even that you are worthy of praise, that you truly have gifts, and that human judgment is not false. Even then you ought not to be high-minded. You have nothing from yourself, but have received everything from God. Why do you present yourself as having what you do not have? What you have, others also have with you.
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Consequently, you have received not only this or that, but everything you have. Your excellences are not from you, but from the grace of God. If you point to faith, it is from the calling. If you point to forgiveness of sins, to gifts, to the ability to teach, to virtues, you received everything from there.
Tell me, then, what do you have that you did not receive, but attained by yourself? You cannot point to anything. You received, and therefore you exalt yourself? For this very reason you ought to humble yourself, since what was given belongs not to you, but to the Giver.
If you received, then you received from Him. If you received from Him, then you received what is not your own. If you received what is not your own, why do you exalt yourself as though you had everything from yourself? Therefore the Apostle added, "Now if you received it, why do you boast as though you had not received it?" (1 Cor 4:7).
Thus, after proving his thought consistently, he then shows that they still lack much. He says: even if you had received everything, you still should not boast, because all this is not yours. But now you still do not have much.
At the beginning he hinted at this when he said, "I could not speak to you as to spiritual men" (1 Cor 3:1). And again, "I determined not to know anything among you except Jesus Christ and Him crucified" (1 Cor 2:2). Here, however, he impresses it upon them with reproach and says, "You are already full, you are already rich" (1 Cor 4:8). That is, you need nothing more. You have become perfect, have reached the very summit, and consider yourselves in need of no one's help, neither Apostles nor teachers.