In 2 Corinthians 2:4, Paul says he wrote an earlier letter through many what?

Answer: Tears

Paul wrote 'through many tears... out of great distress and anguish of heart,' not to grieve them but to show his love.

“For through many tears I wrote you out of great distress and anguish of heart, not to grieve you but to let you know how much I love you.”— 2 Corinthians 2:4 (BSB)