Nonviolence is not merely the crude idea of not hurting any living thing and fleeing from aggression. It is a resistance of every evil thought, of undue haste, of lying, of hatred, of wishing ill to anybody and it is violated by our holding on to what the world needs.
Definition.com
Trivia.com
Nonviolent resistance movements are twice as likely to achieve their goals as violent ones, due in large part to their greater potential to elicit mass participation.
Meme.com

Definition.com
Nonviolence is 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.
Definition.com
Nonviolence is not a garment to be put on and off at will. Its seat is in the heart, and it must be an inseparable part of our being.
Definition.com
Nonviolence is not a moral principle but a strategy... there is no moral goodness in using an ineffective weapon.