“If there is no struggle, there is no progress. Those who profess to favor freedom and yet deprecate agitation are people who want crops without plowing up the ground. They want rain without thunder and lightening. That struggle might be a moral one; it might be a physical one; it might be both moral and physical, but it must be struggle. Power concedes nothing without a demand. It never did and never will. People might not get all that they work for in this world, but they must certainly work for all they get."
Check out "There Is No Progress," a great short video Mauri Belarmino put together based on this quote.