John Chrysostom

"Now for a recompense in like kind (I speak as unto my children,) be ye also enlarged." And yet it is not an equal return, first to be loved, afterwards to love. For even if one were to contribute that which is equal in amount, he is inferior in that he comes to it second. …

Homily 13 on 2 Corinthians ↗

Theophylact of Ohrid

Show the same mutuality and equality of friendship on your part as well, and open your hearts just as I have opened mine. He shows that this is how it ought to be, for he says: "I speak as to children." I ask nothing great when, being a father, I desire to be loved by my children, for this is the duty of children.

Commentary on 2 Corinthians ↗

Thomas Aquinas

Then he urges them to enlarge their hearts, saying, In return [having the same recompense], widen your hearts also. As if to say: if you had been deceived and straightened by a false apostle, then do not continue in that state, but try to have a large heart, as we have, because you love the same recompense as we. Therefore he says, having the same recompense as we: "For we know that as you share in our sufferings, so also you share in our consolation" (2 Cor. 1:7). …

Commentary on 2 Corinthians ↗