Cross reference
2 Corinthians 10:11
11 Let such a person consider this, that what we are in word by letters when we are absent, such are we also in deed when we are present.
1 Corinthians 4:19-20
19 But I will come to you shortly, if the Lord is willing. And I will know, not the word of those who are puffed up, but the power.
20 For the Kingdom of God is not in word, but in power.
2 Corinthians 12:20
20 For I am afraid that by any means, when I come, I might find you not the way I want to, and that I might be found by you as you don't desire; that by any means there would be strife, jealousy, outbursts of anger, factions, slander, whisperings, proud thoughts, riots;
2 Corinthians 13:2-3
2 I have said beforehand, and I do say beforehand, as when I was present the second time, so now, being absent, I write to those who have sinned before now, and to all the rest, that, if I come again, I will not spare;
3 seeing that you seek a proof of Christ who speaks in me; who toward you is not weak, but is powerful in you.
2 Corinthians 13:10
10 For this cause I write these things while absent, that I may not deal sharply when present, according to the authority which the Lord gave me for building up, and not for tearing down.