John Chrysostom, on Rom 1:14

Which also he said when writing to the Corinthians. And he says it, to ascribe the whole to God. (1 Cor. ix. 16.) And see him here also unassuming, for he does not say, that I may teach and instruct, but what? "that I might have some fruit." And not fruit, simply, but "some fruit." Again, depreciating his own share therein just as he had said above, "that I may impart some gift." And then to repress them too, as I said also before, he says, "even as among other Gentiles." For, I do not, because you are rich, and have the advantage of others, show less concern about the others. For it is not the rich that we are seeking, but the faithful. Where now are the wise of the Greeks, they that wear long beards and that are clad in open dress, and puff forth great words? All Greece and all barbarian lands has the tentmaker converted. But Plato, who is so cried up and carried about among them, coming a third time to Sicily with the bombast of those words of his, with his brilliant reputation, did not even get the better of a single king, but came off so wretchedly, as even to have lost his liberty. But this tentmaker ran over not Sicily alone or Italy, but the whole world; and while preaching too he desisted not from his art, but even then sewed skins, and superintended the workshop. And even this did not give offence to those who were born of consuls, and with very good reason, for it is not their trades and occupations, but falsehood and forged doctrines, which usually render teachers easy subjects of contempt. And for this reason, even Athenians still laugh at the former. But this man even barbarians attend to, and even foolish and ignorant men. For his preaching is set forth to all alike, it knows no distinction of rank, no preeminence of nation, no other thing of the sort; for faith alone does it require, and not reasonings. Wherefore it is most worthy of admiration, not only because it is profitable and saving, but that it is readily admissible and easy, and comprehensible to all: which is a main object in the Providence of God, who setteth forth His blessings to all in common.

For what He did in respect of the sun and the moon and the earth and the sea and other things, not giving the rich and the wise a greater share of the benefits of these, and a less to the poor, but setting forth the enjoyment of them to all alike, this also did He with regard to the preaching, and even in a much greater degree, by how much this is more indispensable than they. Wherefore Paul repeatedly says, "among all the Gentiles," to show that he in no respect favors them, but is fulfilling his Master's command, and sending them away to thanksgiving to the God of all.