The moment a man claims a right to control the will of a fellow being by physical force, he is at heart a slaveholder. – Henry C. Wright, The Liberator, 7 April 1837

I object to violence because, when it appears to do good, the good is only temporary; the evil it does is permanent. – Mohandas K. Gandhi (1869–1948), in Young India, 1925

The limitation of riots, moral questions aside, is that they cannot win and their participants know it. Hence, rioting is not revolutionary but reactionary because it invites defeat. It involves an emotional catharsis, but it must be followed by a sense of futility. – Martin Luther King, Jr.