John Chrysostom

"But that I may not seem as if I would terrify you: for his letters, say they, are weighty and strong: but his bodily presence is weak, and his speech of no account. Let such a one reckon this, that what we are in word by letters when we are absent, such are we also in deed when we are present." What he says is this: 'I could boast indeed, but that they may not say the same things again, to wit, that I boast in my letters, and am contemptible when present, I will say nothing great.' And yet afterwards he did say something great, but …

Homily 22 on 2 Corinthians ↗

Theophylact of Ohrid

As he is in words, so also in deed: I could boast, but do not think that I am frightening you with epistles, as my slanderers say: "he boasts in his epistles and sends threatening letters, but in personal presence he is insignificant and is not such as he is in his epistles." But let everyone who speaks thus know that we not only threaten in our epistles, but in personal presence we can also carry out our threats.

Commentary on 2 Corinthians ↗

Thomas Aquinas

Then when he says, I would not seem to be frightening you, he pursues his cause with the evidence of the facts. In regard to this he does three things. First, he shows that the charge laid against him is false; secondly, the reason he says this (v. 12); thirdly, he explains the reason (v. 13). In regard to the first it should be noted that, as has been said, it was charged that the Apostle, when he was present, was humble out of fear or to win their favor; but when he was absent, he wrote harshly to them. …

Commentary on 2 Corinthians ↗