John Chrysostom
Do you see how he says nothing superfluous? He could have pointed to the whole world, to barbarian nations, to land and sea. Yet he says nothing of this kind, but speaks in relation to them, and so conquers more forcefully.
What need have I, he says, to speak at great length, when even this is enough for the present matter? I do not speak of the contests I accomplished among others, but of those to which you yourselves are witnesses.
Therefore, if not from others, then from you especially I could have received support. Yet from those from whom I especially ought to have received it, since I was your teacher, from them I received nothing.
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“If I am not an Apostle to others, yet surely I am to you.” Again he speaks in relation to them. He was Apostle of the whole world, but, he continues, I do not speak of this. I do not argue or insist on it, but mention what concerns you.
“For the seal of my apostleship is you,” that is, the proof. Whoever wishes to be assured of my apostleship, he says, I point him to you. Everything proper to an Apostle I did among you, and I left nothing undone.
He explains the same thing in the second epistle: “though I am nothing. The signs of an Apostle were performed among you in all patience, in signs, wonders, and mighty deeds. For in what were you inferior to the other churches?” (2 Cor 12:11-13).
Therefore he also says, “The seal of my apostleship is you.” Among you I both showed signs and taught by word. I underwent dangers and lived a blameless life.
All this can be seen in his two epistles to them, in which he explains each of these struggles with complete precision.