Nah, I'm tryna' kick the shit you need to learn though
That ether, that shit that make your soul burn slow

from Nas – Ether Lyrics on Rap Genius

Meaning

Burny, yet melodramatic (ultimately a hot line)

The line is also counter to a line from “Takeover.”

Your shit is garbage
What you trying to kick, knowledge?

Soul burn slow” might also be an intentional rhyming flip on some lines from Biggie’s “Who Shot Ya?”.

Old school, new school need to learn though/
I burn, baby, burn like ‘Disco Inferno

Ether is also an ingredient used in making the more high quality crack cocaine. It makes a rather short high last longer making the crack burn slower

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