John Chrysostom

"For I reckon that I am not a whit behind the very chiefest Apostles," no longer making comparison of himself with them, but with Peter and the rest. "So that if they know more than I do, [they know more] than they also." And observe how here also he shows modesty. For he did not say, "the Apostles said nothing more than I," but what? …

Homily 23 on 2 Corinthians ↗

Theophylact of Ohrid

At last he compares himself with the followers of Peter, wishing to show by this that if they know more than he, then they also know more than the chiefest apostles, reducing the matter to absurd conclusions. See what self-abasement: "I suppose," he says, but affirms nothing. Not simply apostles, he says, but "the very chiefest," alluding to Peter, John, and James. He says this because now it was necessary, whereas in another place he said: "I am not worthy to be called an apostle" (1 Cor. 15:9).

Commentary on 2 Corinthians ↗

Thomas Aquinas

Then when he says, I think that I am not in the least inferior, he removes this excuse. In regard to this he does two things. First, he shows that he did not do less for them than the others; secondly, that he did more (v. 7). In regard to the first he does three things. First, he shows that he did nothing less in deed than the other apostles; secondly, he suggests that he was not lacking the means to do this (v. 6); thirdly, he presents the evidence for both (v. 6b). …

Commentary on 2 Corinthians ↗