2 Corinthians 10:9

Overview - 2 Corinthians 10
Against the false apostles, who disgraced the weakness of his person and bodily presence, he shows the spiritual might and authority with which he was armed against all adverse powers;
assuring them that at his coming he will be found as mighty in word as he is now in writing, being absent;
12 and withal taxing them for reaching out themselves beyond their compass, and vaunting themselves of other men's labours.
Treasury of Scripture Knowledge

2 Corinthians 10:9  (King James Version)
That I may not seem as if I would terrify you by letters.

10 ; 1 Corinthians 4:5 1 Corinthians 4:19-21