2 Corinthians 7:8-11 CSB
For even if I grieved you with my letter, I don’t regret it. And if I regretted it — since I saw that the letter grieved you, yet only for a while — I now rejoice, not because you were grieved, but because your grief led to repentance. For you were grieved as God willed, so that you didn’t experience any loss from us. For godly grief produces a repentance that leads to salvation without regret, but worldly grief produces death. For consider how much diligence this very thing — this grieving as God wills — has produced in you: what a desire to clear yourselves, what indignation, what fear, what deep longing, what zeal, what justice! In every way you showed yourselves to be pure in this matter.
CSB: Christian Standard Bible