The reflection of nature in man's thought must be understood not lifelessly but in the eternal process of movement, the arising of contradictions and their solution.

Unity is a great thing and a great slogan. But what the workers’ cause needs is the unity of Marxists, not unity between Marxists, and opponents and distorters of Marxism.

The constitution of Soviet Russia must insure equal rights for all citizens regardless of sex, creed, race, or nationality.

The only one who doesn't make mistakes is the one who doesn't do anything.

All official and liberal science defends wage-slavery, whereas Marxism has declared relentless war on that slavery.

You must have your heart on fire and your brain on ice.

Soviet power is a new type of state in which there is no bureacracy, no police, no standing army.