The working classes in every country only learn to fight in the course of their struggles...Social democracy...is only the advance guard of the proletariat, a small piece of the total working masses; blood from their blood, and flesh from their flesh. Social democracy seeks and finds the ways, and particular slogans, of the workers' struggle only in the course of the development of this struggle, and gains directions for the way forward through this struggle alone.

History is the only true teacher, the revolution the best school for the proletariat.

Freedom only for the members of the government, only for the members of the Party - though they are quite numerous - is no freedom at all.

The masses are in reality their own leaders, dialectically creating their own development process.

Self-criticism, cruel, unsparing criticism that goes to the very root of the evil, is life and breath for the proletarian movement.

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

The masses are the decisive element, they are the rock on which the final victory of the revolution will be built.