It takes heart to be a guerrilla warrior because you're on your own. In conventional warfare you have tanks and a whole lot of other people with you to back you up—planes over your head and all that kind of stuff. But a guerrilla is on his own. All you have is a rifle, some sneakers and a bowl of rice, and that's all you need—and a lot of heart.

The Ballot or the Bullet (1964) - Speech in Cleveland, Ohio (April 3, 1964)