Religion is the opium of the masses. – Karl Marx
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. – Karl Marx
The history of all previous societies has been the history of class struggles. – Karl Marx
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