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 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.

There can be nothing more abominable than religion.

The bourgeoisie is many times stronger than we. To give it the weapon of freedom of the press is to ease the enemy's cause, to help the class enemy. We do not desire to end in suicide, so we will not do this.

As an ultimate objective, "peace" simply means communist world control.

Capitalists are no more capable of self-sacrifice than a man is capable of lifting himself up by his own bootstraps.