Then the voice spoke again, saying: "Cain, he who commits a crime is a sinner, but he who repays evil with evil is a servant of sin. The one who rewards good with good has paid his debt, but there is nothing left for him. He, who rewards a good deed manifold, is worthy of his brothers. However, before God only one thing counts and that is, to return good for evil, bless those who curse their benefactors and give one's life for death. – The Household of God, Book 1, Chapter 20, Paragraph 30