You've cut me and have scarred me through and through
And I'll walk out a wiser weaker man
Mister Congressman, you can't understand

from Johnny Cash – San Quentin Lyrics on Rap Genius

Meaning

His experience in prison scarred him and changed him forever.

A congressman or similarly rich/privileged person can’t understand what prison is like, and even if they pretend to they can’t really relate to him.

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