And he said unto me, My grace is sufficient for you: for my strength is made perfect in weakness. Most gladly therefore will I rather boast in my weaknesses, that the power of Christ may rest upon me.
All Commentaries on 2 Corinthians 12:9 Go To 2 Corinthians 12
Ambrosiaster
AD 400
Paul is clearly teaching that the time for boasting is when one is being humiliated by unjust injuries. Christ gives us the power to endure these so that what previously appeared to be painful and loathsome may be accepted with gladness. Commentary on Paul’s Epistles.