Ambrosiaster : It is superfluous, but in order to demonstrate his diligence, it was necessary for Paul to write like this, so that they would be all the more willing to do what they were asked and to embody the truth they were being taught. For superfluities tend to show greater concern. Our Lord did not doubt Peter's love for him, but even so he asked the apostle three times: "Simon, son of John, do you love me?" This repetition may seem to be superfluous, but it contributed to the perfecting of the admonition. At length Peter would learn from it that he must act with great diligence. — COMMENTARY ON PAUL'S EPISTLES John Chrysostom : Though he had said so much about it, he says here, "It is superfluous for me to write to you." And his wisdom is shown not only in this, that though he had said so much about it, he saith, "it is superfluous for me to write to you," but in that be yet again speaketh of it. For what he said indeed a little above, he said concerning those who received the money, to ensure them the enjoyment of great honor: but what he said before that, (his account of the Macedonians, that "their deep poverty abounded unto the riches of their liberality," and all the rest,) was concerning loving-kindness and alms-giving. But nevertheless even though he had said so much before and was going to speak again, he says, "it is superfluous for me to write to you." And this he does the rather to win them to himself. For a man who has so high a reputation as not to stand in need even of advice, is ashamed to appear inferior to, and come short of, that opinion of him. — Homily 19 on 2 Corinthians