1-john 3:12

Wherefore - Why?; for what reason?; for what cause?

Not as Cain - Men should not act to each other as Cain did to his brother Abel. He murdered him because he was better than himself. But who was Cain? Εκ του πονηρου ην, he was of the devil. And who are they who, through pride, lust of power, ambition, gain, etc., murder each other in wars and political contentions? Εκ του πονηρου εισι. To attempt to justify the principle, and excuse the instigators, authors, abettors, etc., of such wars, is as vain as it is wicked. They are opposed to the nature of God, and to that message which he has sent to man from the beginning: Love one another. Love your enemies. Surely this does not mean, Blow out their brains, or, Cut their throats. O, how much of the spirit, temper, and letter of the Gospel have the nations of the world, and particularly the nations of Europe, to learn!

And wherefore slew he him? - What could induce a brother to imbrue his hands in a brother's blood? Why, his brother was righteous, and he was wicked; and the seed of the wicked one which was in him induced him to destroy his brother, because the seed of God - the Divine nature, was found in him.

Not as Cain - Not manifesting the spirit which Cain did. His was a most remarkable and striking instance of a want of love to a brother, and the case was well adapted to illustrate the propriety of the duty which the apostle is enjoining. See Genesis 4:4-8.

Who was of that wicked one - Of the devil; that is, he was under his influence, and acted from his instigation.

And wherefore slew he him? - Because his own works were evil, and his brother's righteous." He acted under the influence of envy. He was dissatisfied that his own offering was not accepted, and that his brother's was. The apostle seems desirous to guard those to whom he wrote against the indulgence of any feelings that were the opposite of love; from anything like envy toward more highly favored brethren, by showing to what this would lead if fairly acted out, as in the case of Cain. A large part of the crimes of the earth have been caused, as in the murder of Abel, by the want of brotherly love. Nothing but love would be necessary to put an end to the crimes, and consequently to a large part of the misery, of the world.

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.