Adam Clarke on 2 Corinthians 2:4

For out of much affliction, etc. - It is very likely that the apostle's enemies had represented him as a harsh, austere, authoritative man; who was better pleased with inflicting wounds than in healing them. But he vindicates himself from this charge by solemnly asserting that this was the most painful part of his office; and that the writing of his first epistle to them cost him much affliction and anguish of heart, and many tears.