I don't think I'll ever be happy until I rest in peace
Of mind, and find who I am

from Common – Book of Life Lyrics on Rap Genius

As well as being a complete play of words, his flow sets up this dark joke:

the narrator won’t be happy until he’s dead… PSYCH!
He’ll be happy when he settles into himself and makes sense of all his conflicting thoughts/impulses (as we all do with age).

it’s worth noting how hopeful the end of this verse is. even to mention this idea/detail reflects the narrator’s deeper wisdom

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