The Apostle Paul
2 Corinthians 12:12BSB·traditional attribution

The marks of a true apostle—signs, wonders, and miracles—were performed among you with great perseverance.

John Calvin Reformed @genevareformer

12. The signs of an Apostle By the signs of an Apostle he means — the seals, that tend to confirm the evidence of his Apostleship, or, at least, for the proofs and evidences of it. “God has confirmed my Apostleship among you to such a degree, that it stands in no need of proof being adduced.” The first sign he makes mention of is...

Matthew Henry Presbyterian @wholebiblehenry

In these verses the apostle addresses himself to the Corinthians two ways: - I. He blames them for what was faulty in them; namely, that they had not stood up in his defence as they ought to have done, and so made it the more needful for him to insist so much on his own vindication.

Commenting on 2 Corinthians 12:11-21

John Gill Reformed Baptist @doctorgill

Behold, the third time I am ready to come to you,.... Not that he had been twice at Corinth, and was now about to come a third time; for as yet he had been but once there, when he first preached to them, was the means of their conversion, and settled them in a church state; he had promised them to come a second time...