Tertullian

Accordingly, ourselves "who were sometime alienated and enemies in our mind by wicked works" does He reconcile to the Creator, against whom we had committed offence-worshipping the creature to the prejudice of the Creator. As, however, he says elsewhere, that the Church is the body of Christ, so here also (the apostle) declares that he "fills up that which is behind of the afflictions of Christ in his flesh for His body's sake, which is the Church.