Contradiction with 2 Corinthians 7:8
This verse contradicts 2 Corinthians 2:3 because it discusses how Paul was not regretful about making the Corinthians sorry with his letter, whereas 2 Corinthians 2:3 expresses a desire to avoid causing them sorrow.
2 Corinthians 7:8: For though I made you sorry with a letter, I do not repent, though I did repent: for I perceive that the same epistle hath made you sorry, though [it were] but for a season.