2 Corinthians 10:8-11 New King James Version (NKJV)

8. For even if I should boast somewhat more about our authority, which the Lord gave us for edification and not for your destruction, I shall not be ashamed—

9. lest I seem to terrify you by letters.

10. “For his letters,” they say, “are weighty and powerful, but his bodily presence is weak, and his speech contemptible.”

11. Let such a person consider this, that what we are in word by letters when we are absent, such we will also be in deed when we are present.

2 Corinthians 10