Though the devil mind state blood kin cannot relate
No longer, brothers, we unstable
Like Kane when he slew Abel, killing each other

from Wu-Tang Clan – A Better Tomorrow Lyrics on Rap Genius

Meaning

When you are in the mindset of envy, greed, lust, and hate. it makes you evil and think evil thoughts so much that you will not even be able to relate to family, alluding to sin (envy) when Cain killed his brother

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