Freedoms a state a mind
And just the heart of me's in hell
I free my slave mind so a part of me's in hell
And when it's hard to breathe, a part of me inhale

from Blu – Below The Heavens Pt. 1 Lyrics on Rap Genius

Great wordplay, brilliant metaphor!

Your mind is the most powerful thing you possess, so even though your physical body (heart) is going through rough times on Earth, you can always be somewhere a bit more pleasant.

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