You only get one life, and yo, because of that
I'm still blazing, going out for the cause

from Nas – Doo Rags Lyrics on Rap Genius

Meaning

In a rebuttal to his own talk about doing your body right, Nas puns here on blazing guns and “blazing” — i.e. getting high. Also note the callback to the “cause”, which now he seems ready to die for, as opposed to his childhood ambivalence expressed in the first verse

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