As I open this book and then burn up some of this reefer

from Kendrick Lamar – Kush & Corinthians (His Pain) Lyrics on Rap Genius

Meaning

Balancing weed and the Bible is a popular theme for rappers to portray, Weezy also did this in his song Misunderstood: “Droppin' ashes in the Bible, I shake ‘em out and they fall on the rifle.”

KL is using a vice(marijuana) and a religious book (the bible) together as a means of pointing out the difference in how the world and Christians escape demons and figure out the world.

Worldly way- Marijuana(in this case), alcohol and other vices
Godly way — The bible(in this case), church, and prayer

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