The history of all previous societies has been the history of class struggles. – Karl Marx
Society does not consist of individuals but expresses the sum of interrelations, the relations within which these individuals stand. – 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
Greek philosophy seems to have met with something with which a good tragedy is not supposed to meet, namely, a dull ending. – Karl Marx