“This is the message that you have heard from the beginning: We should love one another. We must not be like Cain, who belonged to the evil one and killed his brother. And why did he kill him? Because Cain had been doing what was evil, and his brother had been doing what was righteous. So don’t be surprised dear brothers and sisters, if the world hates you.”
I don’t really need to add anything. We can all recognise who is who in this story.
(There really is a lot of wisdom in the Bible. This was written by St John.)