John Chrysostom
Do you see his great wisdom? Since one of them could say, “I am perfect, I have authority over myself, and I eat what is set before me without harm to myself,” he says: suppose you are perfect and have authority over yourself. Yet do not look at this, but at whether your conduct causes any harm or disorder. He expressed both by the words, “not all things are profitable” and “not all things edify.” He means the first about the man himself, and the second about the brother. “Not profitable” points to his own destruction, while “does not edify” points to the brother’s scandal.
Therefore he adds: “Let no one seek his own.” He unfolds this throughout the whole epistle, and likewise in the epistle to the Romans, when he says, “For Christ did not please Himself” (Rom 15:3). Again he says, “Just as I also please all men in all things, not seeking my own profit” (1 Cor 10:33). Here also he does not speak at length about this. Earlier he had proved at length that he never sought his own profit. To the Jews he became as a Jew; to those without the law, as without the law. He did not simply use his freedom and authority, but sought the profit of all, serving all. Therefore here he is content with a few words and ends the discourse, reminding them by these few words of all that had been said before.