John Chrysostom
Do you see that the Apostle rejoices more over them? He says: "You have in no way put your teacher to shame, and you have not proved unworthy of my testimony."
Therefore he rejoiced not so much for Titus, because he received such honor, as for them, because they showed such nobility of soul.
But lest anyone think he rejoiced more on Titus' account, see how here also he sets forth the cause of his joy. As he said above, "I was not put to shame if I boasted of you to him in anything," so here he says, "I rejoice that in everything I can rely on you."
"If I must rebuke you, I do not fear that you will fall away because of it. If I must boast of you, I am not afraid of being convicted of empty praise.
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I can rely on you, whether I praise you as obedient, or as abounding in love, or as zealous. I said, 'Cut him off,' and you cut him off. I said, 'Receive him,' and you received him.
I told Titus that you are great, worthy of admiration, and know how to honor teachers, and you proved this in deed. He learned it not so much from me as from you yourselves.
Therefore he returned to me filled with strong love for you, because in deed you showed more than I had told him."