John Chrysostom

"Therefore we have been comforted." Since we both showed our care for you and have been wholly successful. As he said also in another place, "Now we live, if ye stand fast in the Lord;" and again, "For what is our hope, or joy, or crown of rejoicing? are not even ye?" For this is life, this comfort, this consolation to a teacher possessed of understanding; the growth of his disciples. For nothing doth so declare him that beareth rule as paternal affection for the ruled. …

Homily 15 on 2 Corinthians ↗

Theophylact of Ohrid

I showed my care for you, and my hopes did not deceive me; therefore, he says, I was greatly comforted. Now to the consolation with which you consoled me, as I said, a great joy was added — the joy of Titus. And this joy and consolation is on your account and for your sake.

Commentary on 2 Corinthians ↗

Thomas Aquinas

Then he concludes to the joy he had at their correction when he says, therefore we were comforted. As if to say: because I obtained this from writing to you, namely, that you are corrected, therefore, we were comforted, i.e., we took comfort. For a man is joyful when he obtains what he desired and intended: "But by the grace of God" (2 Cor. 1:12). Then when he says, and besides our own comfort, he states the second cause of his comfort, which is taken from the devotion they showed to Titus. In regard to this he does three things. …

Commentary on 2 Corinthians ↗