John Chrysostom
The meaning of these words is this: "I could boast, but lest they again say that I magnify myself in my letters, while in person I am nothing, I shall say nothing great about myself."
True, later he did speak, yet not about the power by which he was fearsome, but about revelations, and still more about temptations. "Therefore, lest it seem that I am frightening you, let such a one know this: as we are in word by letters when absent, so we are also in deed when present."
Since they said of him that in his letters he wrote many great things about himself, while in person he was of no account, he speaks the words cited above. Yet again he does so with great modesty.
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He did not say, "As we write to you of great deeds, so when present with you we do great deeds." He expressed himself far more modestly.
When he addressed those who considered him a carnal man, he used strong words: "I beg you that when I come I may not have to be bold with that confidence which I think to use against some" (2 Cor 10:2).
But when he turns to these, he acts more gently. Therefore he says, "As we are with you in person, so we are when absent." That is, we are humble, modest, and boast of nothing.
This is clear from the words that follow: "For we dare not class or compare ourselves with those who commend themselves" (2 Cor 10:12). Here the Apostle shows that they are vainglorious and speak much about themselves. He reproves them for praising themselves.
"But we," he says, "do nothing of the sort. If we have done anything great, we ascribe it all to God, and we compare ourselves with one another."
Therefore he adds: "They, measuring themselves by themselves and comparing themselves with themselves, do not understand." The meaning is this: "We do not compare ourselves with them, but with one another."
So also he says of himself below: "I am in no way inferior to the chiefest Apostles" (2 Cor 12:11). Likewise in the first epistle: "I labored more abundantly than they all" (1 Cor 15:10). Again: "The signs of an Apostle were performed among you in all patience" (2 Cor 12:12).
"Thus we compare ourselves with ourselves, and not with those who have nothing. Their haughtiness belongs only to madness."
Therefore he says this either about himself or about them. That is, "We dare not compare ourselves with those who contend with one another and boast, yet do not understand what they are doing. They do not see how ridiculous they are when they boast and exalt themselves before one another."