Nonviolent resistance . . . avoids not only external physical violence but also internal violence of spirit. The nonviolent resister not only refuses to shoot his opponent but he also refuses to hate him. At the center of nonviolence stands the principle of love. The nonviolent resister would contend that in the struggle for human dignity, the oppressed people of the world must not succumb to the temptation of becoming bitter or indulging in hate campaigns. To retaliate in kind would do nothing but intensify the existence of hate in the universe. Along the way of life, someone must have sense enough to cut off the chain of hate. This can only be done by projecting the ethic of love to the center of our lives.
--Martin Luther King Jr., Stride Toward Freedom