2 Corinthians 10:9
Let it not seem as if I wanted to frighten you by my letters.
1 Corinthians 4:5
Therefore form no premature judgements, but wait until the Lord returns. He will both bring to light the secrets of darkness and will openly disclose the motives that have been in people's hearts; and then the praise which each man deserves will come to him from God.
1 Corinthians 4:19-21
But, if the Lord is willing, I shall come to you without delay; and then I shall know not the fine speeches of these conceited people, but their power.
2 Corinthians 10:10
For they say "His letters are authoritative and forcible, but his personal presence is unimpressive, and as for eloquence, he has none."