11. This is the teaching you have heard from the beginning: We must love each other.
12. Do not be like Cain who belonged to the Evil One. Cain killed his brother. He killed his brother because the things Cain did were evil, and the things his brother did were good.
13. Brothers, do not be surprised when the people of this world hate you.
14. We know that we have left death and have come into life. We know this because we love our brothers in Christ. Whoever does not love is still in death.
15. Everyone who hates his brother is a murderer. And you know that no murderer has eternal life in him.
16. This is how we know what real love is: Jesus gave his life for us. So we should give our lives for our brothers.