Matthew Henry Presbyterian @wholebiblehenry

Here we may observe, I. The narrative the apostle gives of the favours God had shown him, and the honour he had done him; for doubtless he himself is the man in Christ of whom he speaks. Concerning this we may take notice, 1. Of the honour itself which was done to the apostle: he was caught up into the third heaven, Co2 12:2.

Commenting on 2 Corinthians 12:1-10

John Gill Reformed Baptist @doctorgill

Of such an one will I glory,.... The apostle in great modesty seems to speak of some other person, and not himself, as caught up into the third heaven, when he yet means himself; and does as it were distinguish himself from himself; himself in paradise from himself on earth; his sense is, that though he might lawfully glory of such a person so highly...

Albert Barnes Presbyterian @notesbybarnes

Verse 3. And I knew such a man. It is not uncommon to repeat a solemn affirmation in order that it may be made more emphatic. This is done here. Paul repeats the idea, that he was intimately acquainted with such a man, and that he did not know whether he was in the body or out of the body. All that was known to God.