What I've learned cannot be taught, what I've earned cannot be bought

from Yelawolf – The Last Song Lyrics on Rap Genius

Meaning

He’s worked for what he’s got, and learned some things along the way.

Usually, you earn money. Money itself can be bought. However, Yela has earned a reputation, respect, etc., which cannot be bought.

And usually, you learn in school, where a teacher teaches you. However, everything Yela has learned is from sheer experience, which can’t be taught.

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