My belief has come about in large measure because of the lives and examples of people I have known - not the famous, not saints, but friends and relations who have lived, and faced death, in the light of the Resurrection story, or in the quiet acceptance that they have a future after they die.
Buddha's doctrine: Man suffers because of his craving to possess and keep forever things which are essentially impermanent...this frustration of the desire to possess is the immediate cause of suffering.
Non-violent resistance implies the very opposite of weakness. Defiance combined with non-retaliatory acceptance of repression from one's opponents is active, not passive. It requires strength, and there is nothing automatic or intuitive about the resoluteness required for using non-violent methods in political struggle and the quest for Truth.
The story of man is the history, first, of the acceptance and imposition of restraints necessary to permit communal life; and second, of the emancipation of the individual within that system of necessary restraints.
Everybody should do in their lifetime, sometime, two things. One is to consider death...to observe skulls and skeletons and to wonder what it will be like to go to sleep and never wake up-never. That is a most gloomy thing for contemplation; it's like manure. Just as manure fertilizes the plants and so on, so the contemplation of death and the acceptance of death is very highly generative of creating life. You'll get wonderful things out of that.