Karl Marx

From each according to their ability, to each according to their need.

It is not the consciousness of men that determines their beeing, but on the contrary, it is their social being that determines their consciousness.

Philosophy is to the real world as masturbation is to sex.

Reason has always existed, but not always in a reasonable form.

The oppressed are allowed once every few years to decide which particular representatives of the oppressing class are to represent and repress them.

Workers of the world unite, you have nothing to lose but your chains.