All I know is I'm not a Marxist.

— Karl Marx

All that philosophers have done is interpret the world in different ways. It is our job to change it.

— Karl Marx

And here it becomes evident that the bourgeoisie is unfit any longer to be the ruling class in society and to impose its conditions of existence upon society as an over-riding law. It is unfit to rule because it is incompetent to assure an existence to its slave within his slavery, because it cannot help letting him sink into such a state that it has to feed him instead of being fed by him. Society can no longer live under this bourgeoisie; in other words, its existence is no longer compatible with society. The essential condition for the existence, and for the sway of the bourgeois class, is the formation and augmentation of capital; the condition for capital is wage-labor. Wage-labor rests exclusively on competition between the laborers. The advance of industry, whose involuntary promoter is the bourgeoisie, replaces the isolation of the laborers, due to competition, by their revolutionary combination, due to association. The development of modern industry, therefore, cuts from under its feet the very foundation on which the bourgeoisie produces and appropriates products. What the bourgeoisie therefore produces, above all, are its own grave diggers. Its fall and the victory of the proletariat are equally inevitable.

— Karl Marx

Anyone who knows anything of history knows that great social changes are impossible without feminine upheaval. Social progress can be measured exactly by the social position of the fair sex, the ugly ones included.

— Karl Marx

As exchange-values, all commodities are merely definite quantities of congealed labor-time.

— Karl Marx

As individuals express their life, so they are.

— Karl Marx

A specter is haunting Europe—the specter of Communism. All the powers of old Europe have entered into a holy alliance to exorcise this specter; Pope and Czar, Metternich and Guizot, French radicals and German police spies. Where is the party in opposition that has not been decried as Communistic by its opponents in power? Where the opposition that has not hurled back the branding reproach of Communism, against the more advanced opposition parties, as well as against its reactionary adversaries? Two things result from this fact. I. Communism is already acknowledged by all European powers to be in itself a power.II. It is high time that Communists should openly, in the face of the whole world, publish their views, their aims, their tendencies, and meet this nursery tale of the Specter of Communism with a Manifesto of the party itself.

— Karl Marx

A spider conducts operations that resemble those of a weaver, and a bee puts to shame many an architect in the construction of her cells. But what distinguishes the worst architect from the best of bees is this, that the architect raises his structure in imagination before he erects it in reality.

— Karl Marx

A use-value, or useful article, therefore, has value only because abstract human labor is objectified or materialized in it. How, then, is the magnitude of this value to be measured? By means of the quantity of the "value-forming substance", the labor, contained in the article. This quantity is measured by its duration, and the labor-time is itself measured on the particular scale of hours, days etc.

— Karl Marx

A use-value, or useful article, therefore, has value only because abstract human labor is objectified or materialized in it. How, then, is the magnitude of value to be measured? By means of the quantity of the "value-forming substance", the labor, contained in the article. This quantity is measured by its duration, and the labor-time is itself measured on the particular scale of hours, days etc.

— Karl Marx