2 Corinthians 10:9-12

that I may not seem as if I would terrify you by my letters. For, His letters, they say, are weighty and strong; but his bodily presence is weak, and his speech of no account. Let such a one reckon this, that, what we are in word by letters when we are absent, such are we also in deed when we are present. For we are not bold to number or compare ourselves with certain of them that commend themselves: but they themselves, measuring themselves by themselves, and comparing themselves with themselves, are without understanding.