Even though he made a castle out of what used to be a house
He did shit that all your favorites rappers only rap about
But most of y'all don't see the castle through the walls

from T.I. (Ft. Christina Aguilera) – Castle Walls Lyrics on Rap Genius

Meaning

Even though he went from rags to riches you shoudln’t judge him as being a rich kid with everything because you don’t know what goes on behind closed doors

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