Callistus I of Rome

Let no one speak deceitfully to his neighbor. The mouth of the malevolent is a deep pit. The innocent person, while he believes easily, falls readily; but though he falls, he rises; and the shuffler, with all his arts, goes headlong to ruin, from which he can never rise or escape. Therefore let everyone weigh well his words, and let him not say to another what he would not say to himself.