1 John 3:12

Not as Cain. For he loved himself only, and hated his brother because he saw that his offering was acceptable to God. As God says to Cain (according to LXX), "Hast thou not sinned, if thou offerest rightly, but dividest not rightly?" "For Cain did this," says S. Augustine (de Civ. xv. 7), "giving to God something which was His, but gratifying himself. Which," says he, "all who do not follow the will of God, but their own will, and in their perversity of heart make Him an offering with which they think He can be bought off, and this too even to gratify their depraved desires." And accordingly Eusebius (de Præp. xi. 4) says that he was appositely called Cain from the Hebrew word kana to envy. See S. Gregory, Mor. x. 6; S. Chrysostom, in Matt. 18., where he speaks of nine degrees of love; and S. Augustine (de Doct. Christ, i. 22), who says, "The rule of love is laid down by God. And in saying 'the whole heart,' &c., He left no portion of our life unemployed, and left no room for the enjoyment of ought beside. So that whatever else comes into our minds as an object of love, it should be swept away into the full current of our complete love for Him. He then who loves his neighbours aright, should at the same time love God with all his heart and mind. And thus loving his neighbour as himself, he should refer all his love of himself and his neighbour to that love of God, who suffers not a single drop to be withdrawn from Him, so as to diminish our love for Him."

Who was of that wicked one. Cain was not of God, but of the devil, by imitating him, and listening to his suggestions. For when the devil could not injure God Himself, he sought to injure man who was His image; the malignity of Cain, and of the devil also, consists in hatred and envy. Such too is the life of tyrants, who like fishes prey upon those who are weaker than themselves. A fish was a type of envy. (See S. Clement, Strom. lib, v.)

And wherefore slew he him? Because his own works were evil. Because he took little account of God, and offered Him the poorer victims, reserving the better ones for himself, and, moreover, envied Abel, who by the more excellent offerings he made was the more acceptable to God. From this envy sprang hatred and ultimately murder. S. Cyprian dwells on this at great length in his treatise " de zelo et livore."

But his brother's righteous. Innocent, righteous, and holy. For he esteemed God above himself, and therefore presented the best offerings he could. There were three special grounds for praising him, his virgin life, his priesthood, and his martyrdom. (As the writer of the Quastiones ad Orosun says); and S. Cyprian (de Bono Patiant.) calls him the Protomartyr. So also Rupert in Isa. lix.; S. Jerome iv. 42.; S. Augustine (contr. Faust, xii. 9 and 10), and others. S. Augustine commences his "City of God" from Abel, and the city of the devil from Cain. See Book xv. 8.