John Chrysostom

"For we stretch not ourselves overmuch, as though we reached not unto you: for we came even as far as unto you in preaching the Gospel of Christ." Not simply 'we came,' but, 'we announced, we preached, we persuaded, we succeeded.' For it is probable that they having merely come to the disciples of the Apostles, ascribed the whole to themselves, from their bare presence among them. …

Homily 22 on 2 Corinthians ↗

Theophylact of Ohrid

Probably, the false apostles and those who went somewhere without any preaching boast of their mere arrival and ascribe everything to themselves. So the apostle says: we do not overextend ourselves, as though we had not reached you, for we reached you not merely, but with the gospel of Christ, that is, we not only came, like those others, but also with the preaching of the Gospel.

Commentary on 2 Corinthians ↗

Thomas Aquinas

That this is so, namely, that it reaches even to them, he proves when he says: For we are not overextending ourselves, as though we did not reach you. As if to say: of course we glory, but we do not stretch beyond ourselves in our grace or glory or power, as if we do not reach to you in our power and ministry: we were the first to come all the way to you with the gospel of Christ, i.e., in the preaching of Christ's Gospel: "For I became your father in Christ Jesus through the Gospel" (1 Cor. …

Commentary on 2 Corinthians ↗