I know that they really got power in a gun
But I also know that they got power in a tongue

from Mack Maine (Ft. Lil Wayne & Talib Kweli) – Celebrate Lyrics on Rap Genius

Meaning

A gun has power, but not as much as the tongue—a restatement, maybe, of https://en.wikipedia.org/wiki/The_pen_is_mightier_than_the_sword

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