“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.”

“Despair is typical of those who do not understand the causes of evil, see no way out, and are incapable of struggle.”

“Freedom in capitalist society always remains about the same as it was in ancient Greek republics: Freedom for slave owners.”