But let us rejoice that we have been bought at a great price, the price of the Lord's own blood, and that because of this we are no longer worthless slaves. For there is a freedom that is baser than slavery, namely, freedom from justice. Whoever has that kind of freedom is a slave of sin and a prisoner of death. So let us give back to the Lord the gifts he has given us; let us give to him who receives in the person of every poor man or woman. Let us give gladly, I say, and great joy will be ours when we receive his promised reward.
Paulinus of Nola (AD 353-431), Ep. 34, 2-4: CSEL 29, 305-306
Hm, that's weird. Paulinus was a friend of Augustine (AD 354-430) and he lived one year longer than Augustine on each end of his life.