Who now rejoice in my sufferings for you, and fill up that which is behind of the afflictions of Christ in my flesh for his body's sake, which is the church:
All Commentaries on Colossians 1:24 Go To Colossians 1
Tertullian of Carthage
AD 220
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."