What is the meaning of 1 John 3:12?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

Do not be like Cain, who belonged to the evil one and murdered his brother. And why did Cain slay him? Because his own deeds were evil, while those of his brother were righteous.

Berean Standard Bible (BSB)

unlike Cain, who was of the evil one, and killed his brother. Why did he kill him? Because his works were evil, and his brother’s righteous.

World English Bible (WEB)

Not{G3756} as{G2531} Cain{G2535}, who was{G2258}{(G5713)} of{G1537} that wicked one{G4190}, and{G2532} slew{G4969}{(G5656)} his{G846} brother{G80}. And{G2532} wherefore{G5484}{G5101} slew{G4969}{(G5656)} he him{G846}? Because{G3754} his own{G846} works{G2041} were{G2258}{(G5713)} evil{G4190}, and{G1161} his{G846} brother's{G80} righteous{G1342}.

Strong's King James

And not like Kayin, who was of the Evil One and slaughtered his own brother. And why was he slaughtered? Because his deeds were evil, and his brother’s were righteous.

The F.O.G*

[12] Don't be like Cain, who belonged to the evil one and murdered his brother. And why did he kill him? Because Cain's actions were evil while his brother's were righteous - jealousy and hatred festered into violence.Do not be like Cain, who belonged to the Evil One and brutally murdered his brother Abel. Why did he commit such a brutal act? Because his deeds were evil, while his brother’s were righteous.

The F.O.G Paraphrase

not as Cain—of the evil one he was, and he did slay his brother, and wherefore did he slay him? because his works were evil, and those of his brother righteous.

Young's Literal Translation