Albert Barnes Commentary 2 Corinthians 13:8

"For we can do nothing against the truth, but for the truth." — 2 Corinthians 13:8 (ASV)

For we. That is, we the apostles.

Can do nothing against the truth, etc. That is, we who are under the influence of the Spirit of God, who have been commissioned by him as apostles, can do nothing that shall be against that great system of truth which we are appointed to promulgate and defend. You need, therefore, fear no partial or severe discipline from us, nor any unjust interpretation of your conduct.

Our aim is to promote the truth and to do what is right; and we cannot, therefore, out of any regard for our own reputation or any personal advantage, do what is wrong, or condone or desire what is wrong in others. We must wish for what is right to be done by others, whatever the effect on us—whether we are regarded as apostles or deceivers.

I suppose, therefore, that this verse is designed to qualify and confirm the sentiment in the previous verse: Paul meant to do only what is right, and he wished all others to do right. Furthermore, whatever the effect on his own reputation, or however he might be regarded, he could not go against the great system of gospel truth which he preached, nor could he even desire that others should ever do wrong, even if it might in any way be to his advantage. It was a fixed principle with him to act only in accordance with truth and to do what was right.