Every movement is propelled by ideas. Ideas define a movement's goals. Ideas express a movement's strategy and tactics. Ideas create shared values. Ideas are the necessary basis of coordinated action.
Ideas create movements.
Paper moves ideas. To pass along a sheet of paper is to pass along the ideas written on it. Paper preserves ideas. If you give a speech, you will only be heard today. If you give a sheet of paper, you may be heard for years by people you've never seen.