2 Corinthians 7:8

7:8 For even if I made you sad by my letter, I do not regret having written it (even though I did regret it, for I see that my letter made you sad, though only for a short time).

2 Corinthians 12:19

12:19 Have you been thinking all this time that we have been defending ourselves to you? We are speaking in Christ before God, and everything we do, dear friends, is to build you up.

2 Corinthians 13:2

13:2 I said before when I was present the second time and now, though absent, I say again to those who sinned previously and to all the rest, that if I come again, I will not spare anyone,