Marxism is not only the theory of socialism, it is an integral world outlook, a philosophical system, from which Marx’s proletarian socialism logically follows. This philosophical system is called dialectical materialism.
Joseph Stalin

One of the basic conditions for the victory of socialism is the arming of the workers Communist and the disarming of the bourgeoisie the middle class.
Vladimir Lenin

Before a Revolution happens, it is perceived as impossible; after it happens, it is seen as having been inevitable.
Roza Luxemburg

We have no compassion and we ask no compassion from you. When our turn comes, we shall not make excuses for the terror.
Karl Marx

Above all, try always to be able to feel deeply any injustice committed against any person in any part of the world. It is the most beautiful quality of a revolutionary.
Ernesto Che Guevara

Freedom does not consist in any dreamt-of independence from natural laws, but in the knowledge of these laws, and in the possibility this gives of systematically making them work towards definite ends.
Friedrich Engels