Factions are a sign of illness in a party.

You cannot make a socialist revolution without really trying.

I do not believe in self-proclaimed parties.

Marxism is always open, always critical, always self-critical.

There are no conditions in which we subordinate the interests of the class as a whole to the interests of any sect, any chapel, any separate organization.

There has been hardly a single year since 1917, and in a certain sense since 1905, without a revolution somewhere in the world in which the workers participated in a rather important way.

Mistakes in themselves are unavoidable.