Karl Marx

Revolutions are the locomotives of history.

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.

But capital not only lives upon labour. Like a master, at once distinguished and barbarous, it drags with it into its grave the corpses of its slaves, whole hecatombs of workers, who perish in the crises.

Capital is dead labor that vampirelike lives only by sucking living labor and lives the more the more labor it suck.