II Corinthians 10:1-2, 10-11

Now I, Paul, myself am pleading with you by the meekness and gentleness of Christ—who in presence am lowly among you, but being absent am bold toward you. But I beg you that when I am present I may not be bold with that confidence by which I intend to be bold against some, who think of us as if we walked according to the flesh.

“For his letters,” they say, “are weighty and powerful, but his bodily presence is weak, and his speech contemptible.” Let such a person consider this, that what we are in word by letters when we are absent, such we will also be in deed when we are present.