John Calvin Commentary 2 Corinthians 7:14

"For if in anything I have gloried to him on your behalf, I was not put to shame; but as we spake all things to you in truth, so our glorying also which I made before Titus was found to be truth." — 2 Corinthians 7:14 (ASV)

But if I have boasted anything to him. He shows indirectly how friendly an attitude he had always maintained toward the Corinthians, and with what sincerity and kindness he had regarded them; for even when they seemed unworthy of praise, he still affirmed many honorable things about them.

Here indeed we have a striking sign of a rightly formed and sincere mind—reproving to their face those whom you love, and yet continuing to hope for good things, and giving others good reason for hope concerning them. Such sincerity should have led them not to take offense at anything that came from him.

Meanwhile, he takes this opportunity to briefly remind them again of his faithfulness in all other matters. "You have until now had the opportunity to know my sincerity, so that I have shown myself to be truthful, and in no way fickle. Therefore, I rejoice that I have now also been found truthful when boasting about you to others."