2 Corinthians 10:1-2, 10-11

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

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.