2 Corinthians 10:9
I do not want to seem to be frightening you with my letters.
1 Corinthians 4:5
So you must stop forming any premature judgments, but wait until the Lord shall come again, for He will bring to light the secrets hidden in the dark and will make known the motives of men's hearts, and the proper praise will be awarded each of us.
1 Corinthians 4:19-21
But I am coming, and coming soon, if the Lord is willing, and then I will find out, not only what those conceited fellows say but what they can do,
2 Corinthians 10:10
For they say, "His letters are impressive and forceful, but his physical personality is unimpressive, and his delivery is perfectly contemptible."