2 Corinthians 10:1-2, 10-11

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

For his letters, say they, are weighty and powerful; but his bodily presence is weak, and his speech contemptible. Let such an one think this, that, such as we are in word by letters when we are absent, such will we be also in deed when we are present.