Revolution is an instrument, like a party is an instrument.

Socialist democracy is not, a luxury and its need is not limited to the most advanced industrial countries.

Periodically, the workers do revolt against bourgeois society, not by a hundred, five hundred, or a thousand, but by the millions.

On the contrary, history generally confirms that the more conscious and the better you are organized in vanguard organizations, the more constructively you operate in the mass organizations of the working class.

Mistakes in themselves are unavoidable.

Factions are a sign of illness in a party.

For Marx, 'pure' economic theory, that is economic theory which abstracts from a specific social structure, is impossible.