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" Theory is the experience of the working class movement in all countries taken in its general aspect. Of course, theory becomes purposeless if it is not connected with revolutionary practices just as practice gropes in the dark if it's path is not illuminated by revolutionary theory, but theory can become a tremendous force in the working class movement if it is built up in indissoluble connection with revolutionary practice; for theory, and theory alone, can give the movement confidence, the power of orientation, and and an understanding of the interrelation of surrounding events; for it, and it alone, could help practice to realize not only how and in which direction classes are moving at the present time, but also how and in which direction they will move in the near future. None other than Lenin uttered and repeated scores of times the well-known thesis that: "without a revolutionary theory there can be no revolutionary movement "
― Joseph Stalin , The Foundations of Leninism
