John Chrysostom
Not stopping at this, he continues: "To the weak I became as weak, that I might gain the weak" (v. 22). Here he speaks with reference to them, the Corinthians, as he said all the rest. What was said before was much greater, but this is nearer to them. Therefore he placed it after everything else. He does the same in the Epistle to the Romans, when he instructs them concerning food, and in many other places. Then, lest by enumerating everything separately he make the discourse too long, he says: "I have become all things to all men, that I might by all means save some." Do you see his excellence? "For all," he says, "I became all things," not hoping to save all, but to save at least some.
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My zeal and ministry were such as belong to one saving all, even though he did not hope to convert all. This is a great thing and shows burning zeal. The sower also sows everywhere, and although not all the seed remains safe, he in any case does his work. By indicating the small number of those being saved through the addition of the words "at least," he consoles those who grieve over this. Although it is impossible that all the seed remain safe, it is also impossible that it all perish. Therefore, by the words "at least," he makes clear that the zealous worker will certainly obtain success.