For we commend not ourselves again unto you, but give you occasion to boast on our behalf, that you may have something to answer them who boast in appearance, and not in heart.
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Ambrosiaster
AD 400
Paul is saying this because of some people who used to take a personal pride in making it known that they had been taught by men who had always been with the Lord. Commentary on Paul’s Epistles.
That ye may have somewhat. Some occasion of glorying about me, some answer to give to my opponents.
Which glory in appearance and not in heart. Who boast of their piety, but know in their conscience that they are hypocrites and false apostles.
We commend not, nor desire to commend ourselves, but they who may do harm to others, and to the progress of the gospel, make it necessary to speak what may give you an occasion to answer their objections, and even to glory in my behalf against those who glory in face, in outward appearances of learning and talents, but not in heart, being sensible themselves that they have no solid grounds of boasting in this manner. (Witham)
See how he is continually obviating the suspicion of appearing to praise himself. For nothing is so offensive to the hearers as for any one to say great and marvellous things about himself. Since then he was compelled in what he said to fall upon that subject, he uses a corrective, saying, 'we do this for your sakes, not for ours, that you may have somewhat to glory of, not that we may.' And not even this absolutely, but because of the false Apostles. Wherefore also he added, To answer them that glory in appearance, and not in heart. Do you see how he has detached them from them, and drawn them to himself; having shown that even the Corinthians themselves are longing to get hold of some occasion, whereby they may have it in their power to speak on their behalf and to defend them unto their accusers. For, says he, 'we say these things not that we may boast, but that you may have wherein to speak freely on our behalf;' which is the language of one testifying to their great love: 'and not...
Paul is concerned to avoid giving the impression that he is praising himself. Nothing would be more offensive to his hearers than that. Since he was forced to defend himself, he insists that he is doing it for their sakes, not for his own glory. His main purpose was to stop those who were abusing their position and thereby harming the church.