10. In this way, the children of God and the children of the devil are made plain; no one who fails to act in righteousness belongs to God, nor anyone who does not love his brother.
11. For this is the message you have heard from the beginning: we should love one another,
12. unlike Cain who belonged to the evil one and slaughtered his brother. Why did he slaughter him? Because his own works were evil, and those of his brother righteous.
13. Do not be amazed, [then,] brothers, if the world hates you.
14. We know that we have passed from death to life because we love our brothers. Whoever does not love remains in death.
15. Everyone who hates his brother is a murderer, and you know that no murderer has eternal life remaining in him.
16. The way we came to know love was that he laid down his life for us; so we ought to lay down our lives for our brothers.
17. If someone who has worldly means sees a brother in need and refuses him compassion, how can the love of God remain in him?
18. Children, let us love not in word or speech but in deed and truth.
19. [Now] this is how we shall know that we belong to the truth and reassure our hearts before him
20. in whatever our hearts condemn, for God is greater than our hearts and knows everything.