The product of mental labor - science - always stands far below its value, because the labor-time necessary to reproduce it has no relation at all to the labor-time required for its original production.

Karl Marx

Karl Marx

Profession: Philosopher
Nationality: German

Some suggestions for you :

The philosophers have only interpreted the world; the thing, however, is to change it.

Necessity is blind until it becomes conscious. Freedom is the consciousness of necessity.

There is a specter haunting Europe, the specter of Communism.

It is not history which uses men as a means of achieving – as if it were an individual person – its own ends. History is nothing but the activity of men in pursuit of their ends.

It is absolutely impossible to transcend the laws of nature. What can change in historically different circumstances is only the form in which these laws expose themselves.

History repeats itself, first as tragedy, second as farce.

Money is the alienated essence of man's work and existence; this essence dominates him and he worships it.

To be radical is to grasp things by the root.

Capital is dead labor, which, vampire-like, lives only by sucking living labor, and lives the more, the more labor it sucks.

All social rules and all relations between individuals are eroded by a cash economy, avarice drags Pluto himself out of the bowels of the earth.

The social principles of Christianity preach cowardice, self-contempt, abasement, submission, humility, in a word all the qualities of the canaille.

The writer may very well serve a movement of history as its mouthpiece, but he cannot of course create it.

Democracy is the road to socialism.

Capitalist production, therefore, develops technology, and the combining together of various processes into a social whole, only by sapping the original sources of all wealth - the soil and the labourer.