For the seal of mine apostleship are ye— "Your conversion to Christianity, is as it were a seal set to make good the truth of my apostleship."
Related Commentaries of 1 Corinthians 9:2
1 Corinthians 9:2
2 If I be not an apostle unto others, yet doubtless I am to you: for the seal of mine apostleship are ye in the Lord.