We are not commending ourselves to you again. Instead, we are giving you an occasion to be proud of us, so that you can answer those who take pride in appearances rather than in the heart.
KJV
For we commend not ourselves again unto you, but give you occasion to glory on our behalf, that ye may have somewhat to [answer] them which glory in appearance, and not in heart.
ASV
We are not again commending ourselves unto you, but speak as giving you occasion of glorying on our behalf, that ye may have wherewith to answer them that glory in appearance, and not in heart.