Everything must justify its existence before the judgment seat of Reason, or give up existence.

Just as Marx used to say about the French Marxists of the late 'seventies: All I know is that I am not a Marxist.

The free development of each is the condition for the free development of all.

I have learned more [from Balzac] than from all the professional historians, economists, and statisticians put together.

By bourgeoisie is meant the class of modern capitalists, owners of the means of social production and employers of wage labor. By proletariat, the class of modern wage laborers who, having no means of production of their own, are reduced to selling their labor power in order to live.

The slave frees himself when, of all the relations of private property, he abolishes only the relation of slavery and thereby becomes a proletarian; the proletarian can free himself only by abolishing private property in general.

Bare-faced covetousness was the moving spirit of civilization from its first dawn to the present day; wealth, and again wealth, and for the third time wealth; wealth, not of society, but of the puny individual, was its only and final aim.