Theophylact of Bulgaria
In these few words he embraces the whole multitude and variety of evil. Those regenerated to incorruptible life must not fall into the snares of malice or prefer what has no being to what truly is. For evil is not a substance, but lies in the defect of a created substance. There is a great difference between life in its own proper being and what only enters it incidentally. They, he says, must appear free from deceit, hypocrisy, envy, and every slander. For deceit and slander are far from the truth and from the teaching preached to you. Deceit seeks the destruction of the one it deceives. Hypocrisy thrives in divergence from reality, while the saving teaching in which you were instructed thrives in the opposite. And what place is there among you for envy and slander?
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You are bound by the unbreakable bond of brotherly love, and cannot suffer harm from any who divide you. Only someone ignorant of Cain's sorrowful history would not know that envy and slander cause quarrel and mutual hatred. Through envy Cain tore apart the brotherly bond, then fell into deceit, hypocrisy, and murder (Gen 4). And that the envious man is not clean from slander can be learned from the example of Joseph's brothers. They spoke many accusations against him to their father (Gen 37).