2 Corinthians 12:11

Paul is saying that he has been forced to disclose the truth of the matter. He is certainly not foolish, having spoken the truth about himself, but is abasing himself in this way in order to make it clear that he is not putting his own merits on display voluntarily.

"For in nothing was I behind the chiefest Apostles." See how he here too again speaks out with greater authoritativeness. For, before indeed he said, "I reckon I am not a whit behind," but here, after those proofs, he now boldly speaks out asserting the fact, as I said, thus absolutely. Not that even thus he departs from the mean, nor from his proper character. For as though he had uttered something great and exceeding his deserts, in that he numbered himself with the Apostles, he thus again speaks modestly, and adds, "Although I be nothing."

Having fully completed what he had to say about his own praises, he did not stay at this; but again excuses himself and asks pardon for what he said, declaring that his doing so was of necessity and not of choice. Still nevertheless, although there was necessity, he calls himself "a fool." And when he began indeed, he said, "As foolish receive me," and "as in foolishness;" but now, leaving out the 'as,' he calls himself "foolish." For after he had established the point he wished by saying what he did, he afterwards boldly and unsparingly grapples with all failing of the sort, teaching all persons that none should ever praise himself where there is no necessity, seeing that even where a reason for it existed, Paul termed himself a fool for so doing. Then he turns the blame also of his so speaking not upon the false Apostles, but wholly upon the disciples. For "ye," he saith, "compelled me." 'For if they gloried, but were not by doing so leading you astray nor causing your destruction, I should not have been thus led on to descend unto this discussion: but because they were corrupting the whole Church, with a view to your advantage I was compelled to become foolish.' And he did not say, 'For I feared lest if they obtained the highest estimation with you, they should sow their doctrines,' yet this indeed he set down above when he said, "I fear, lest by any means, as the serpent deceived Eve, so your minds should be corrupted." Here however he does not so express himself, but in a more commanding manner and with more authority, having gained boldness from what he had said, "For I ought to have been commended of you." Then he also assigns the reason; and again he mentions not his revelations nor his miracles only, but his temptations also.