John Chrysostom
The meaning of these words is this: "I could boast. But lest they again say that in letters I exalt myself, while in person I am nothing, I shall say nothing great about myself."
It is true that later he did speak, but not about the power by which he was fearsome. He spoke about revelations, and still more about temptations.
"Therefore, lest it seem that I frighten you, let such a one know that, as we are in word by letters when absent, so we are also in deed when present."
Since they said that in his letters he wrote many great things about himself, but in person was of no account, he says the words just quoted, yet again with great modesty.
He did not say: "As we write to you about great deeds, so when present with you we do great deeds." He expressed himself much more modestly.
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When he addressed those who considered him a fleshly man, he used strong expressions: "I beseech you, that when I come I may not have to be bold with that firm confidence which I intend 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 also 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 rebukes them for praising themselves.
"But we," he says, "do nothing of the kind. If we have done anything great, we ascribe everything to God and compare ourselves with one another."
Therefore he adds: "they measure themselves by themselves and compare themselves with themselves, without understanding." The meaning is this: "We do not compare ourselves with them, but with one another."
So he says about himself below: "I am in no way inferior to the chief 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 them, who have nothing. Their arrogance 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, boast, and 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."