It itself, life is an obstacle

from Common – Book of Life Lyrics on Rap Genius

Meaning

the narrator notes that without the extra trials of the ghetto, life is difficult enough.

here ‘obstacle’ is a call-back/play on the last line. a ‘block’ in someone’s path is an obstacle, so the ‘blocks’ seem to represent chunks of time in the narrator’s life.

putting it all together, time itself becomes an obstacle here (the existential strain of being alive, in other words)

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