Nonviolence means avoiding not only external physical violence but also internal violence of spirit. You not only refuse to shoot a man, but you refuse to hate him. – Martin Luther King, Jr.

He who loves the bristle of bayonets only sees in the glitter what beforehand he feels in his heart. It is avarice and hatred; it is that quivering lip, that cold, hating eye, which built magazines and powder-houses. – Ralph Waldo Emerson

They are not following dharma who resort to violence to achieve their purpose. But those who lead others through nonviolent means, knowing right and wrong, may be called guardians of the dharma. – Buddha

And so, to the end of history, murder shall breed murder, always in the name of right and honor and peace, until the gods are tired of blood and create a race that can understand. – George Bernard Shaw, "Caesar and Cleopatra"