Capital brings forth living offspring, or at the least, lays the golden eggs.

Language is as old as consciousness, language is practical, real consciousness that exists for other men as well, and only therefore does it also exist for me; language, like consciousness, only arises from the need, the necessity, of intercourse with other men.

Natural science will in time incorporate into itself the science of man, just as the science of man will incorporate into itself natural science: there will be one science.

The need of a constantly expanding market for its products chases the bourgeoisie over the entire surface of the globe.

The imaginary flowers of religion adorn man's chains. Man must throw off the flowers, and also the chains.

Once the inner connection is grasped, all theoretical belief in the permanent necessity of existing conditions collapses before their collapse in practice -- Letter to Ludwig Kugelmann (July 11, 1868)

Religion is the opium of the masses.