That's why we stay in the lab at night
I've been staring into this path for over half my life
A true artist won't be satisfied
So I guess that's the sacrifice

from Macklemore and Ryan Lewis (Ft. Macklemore) – Make The Money Lyrics on Rap Genius

Meaning

Just saying that as a creative artist you should never be satisfied, always striving for more. Despite his success he wants more and better so he keeps writing, waiting for that supreme inspiration.

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