“Only by openly proclaiming revolution, by purging the workers’ parties of all who oppose revolution or “sceptically” accept it—only by giving every aspect of party activity a revolutionary content, can Social-Democracy, in such “critical” eras of world history as the present one, guarantee the masses either complete success of their cause if the revolution is supported by very broad masses, or reforms, i.e., concessions by the bourgeoisie, if the revolution is only partially successful.”
Vladimir Lenin, Theses for an Appeal to the I.S.C.