Galatians 6:17. “From henceforth let no man trouble me: for I bear in my body the marks of the Lord Jesus.”
The judaizers had certainly left their mark on Christianity. They had many people believing that without the mark of circumcision they were not truly born again. Paul seems to be weary of the argument here, as he states quite clearly that he has plenty of marks on his body to witness his love for and service to God.
He bore the scars of the stoning outside of Lystra; he was beaten three times with 39 stripes. He was shipwrecked, snakebitten, and imprisioned for the cause of Christ. He says here that no further bodily scars will make his Christianity any more clear than the ones he already bears.