Tertullian

The world, in the apostle's sense, here means life and conversation according to worldly principles; it is in renouncing these that we and they are mutually crucified and mutually slain. He calls them "persecutors of Christ." But when he adds, that "he bare in his body the scars of Christ"-since scars, of course, are accidents of body -he therefore expressed the truth, that the flesh of Christ is not putative, but real and substantial, the scars of which he represents as borne upon his body.