“Wherefore also in the Gospel it is written: ‘if I have wronged any man of any thing, I restore him fourfold.’ (Lk. 19)... And it is read in Divine Law: ‘Cursed is everyone who moves over his neighbour’s landmarks: and all the people shall say: Amen.’ (Dt. 27)
　Such things therefore may not be presumed without vengeance, nor exercised without one’s own damnation.”  Pope St. John I, Epistle to Archbishop Zachary, “De non accusandis episcopis”, 523 A.D