Marcus Garvey visited Nova Scotia in the 20's and 30's and gave a speech in Cape Breton that included this passage:
We are going to emancipate ourselves from mental slavery because whilst others might free the body, none but ourselves can free the mind. Mind is your only ruler, sovereign. The man who is not able to develop and use his mind is bound to be the slave of the other man who uses his mind, because man is related to man under all circumstances for good or ill.
And here's Bob Marley's Redemption Song:
