2 Corinthians 10:2, 6, 8-9

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.

and being in readiness to avenge all disobedience, when your obedience shall be made full.

For though I should glory somewhat abundantly concerning our authority (which the Lord gave for building you up, and not for casting you down), I shall not be put to shame: that I may not seem as if I would terrify you by my letters.