2 Corinthians 10:9-12

for I do not wish to seem as if I would terrify you by my letters. For they say, “His letters are weighty and strong, but his personal presence is unimpressive and his speech contemptible.” Let such a person consider this, that what we are in word by letters when absent, such persons we are also in deed when present. For we are not bold to class or compare ourselves with some of those who commend themselves; but when they measure themselves by themselves and compare themselves with themselves, they are without understanding.