3:12 {12} Not as Cain, [who] was of that wicked one, and slew his brother. {13} And wherefore slew he him? Because his own works were evil, and his brother's righteous.
(12) An amplification taken from the contrary example of Cain who slew his brother.
(13) A short digression: Let us not marvel that we are hated by the world for doing our duty, for such was the condition of Abel who was a just person: and who would not rather be like him than Cain?
3:12 Not as Cain, [who] was of that wicked one. Cain, who hated and slew his brother (Ge 4:8), is an extreme type of children of the devil. This hater and murderer is condemned far more severely in the Scriptures than the disobedient Adam.
3:12 Who was of the wicked one - Who showed he was a child of the devil by killing his brother. And wherefore slew he him - For any fault? No, but just the reverse; for his goodness.
3:11-15 We should love the Lord Jesus, value his love, and therefore love all our brethren in Christ. This love is the special fruit of our faith, and a certain sign of our being born again. But none who rightly know the heart of man, can wonder at the contempt and enmity of ungodly people against the children of God. We know that we are passed from death to life: we may know it by the evidences of our faith in Christ, of which love to our brethren is one. It is not zeal for a party in the common religion, or affection for those who are of the same name and sentiments with ourselves. The life of grace in the heart of a regenerate person, is the beginning and first principle of a life of glory, whereof they must be destitute who hate their brother in their hearts.
