It was a practice to brand slaves with their owners' initials. A slave by showing the brand proved to whom his service was due and that no one else had a claim upon him. The marks of the Lord Jesus which Paul bore (Gal. 6:17) were the scars received in his service —the marks of the rods with which he was beaten and the wounds he received in fighting with wild beasts. He showed them as evidence that he belonged to the Lord Jesus.