But the only thing I fear is fear itself

from Hieroglyphics – You Never Knew Lyrics on Rap Genius

Meaning

Reference to FDR’s first inaugural address. You should know this, but he was president, and he made the phrase “nothing to fear but fear itself” when reassuring Americans who were caught in the great depression. That was a paraphrase of the words of Sir Francis Bacon. So, it’s a reference to a reference.

This could also be referencing casuals first album fear itself, going along with the previous lines mentioning 93 til' infinity.

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