Use the quotation and your knowledge of social studies to answer the following question.
"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."
~ Mohandas Gandhi
The above ideas were part of the philosophy of which of the following?