Karl Marx

"The ruling ideas of each age have ever been the ideas of its ruling class."

"Capital is money, capital is commodities. By virtue of it being value, it has acquired the occult ability to add value to itself. It brings forth living offspring, or, at the least, lays golden eggs."

"Experience praises the most happy the one who made the most people happy."

"In a higher phase of communist society... only then can the narrow horizon of bourgeois right be fully left behind and society inscribe on its banners: from each according to his ability, to each according to his needs."

"In bourgeois society capital is independent and has individuality, while the living person is dependent and has no individuality."

"Landlords, like all other men, love to reap where they never sowed."

"Men's ideas are the most direct emanations of their material state."

"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."

"Religion is the impotence of the human mind to deal with occurrences it cannot understand."

"Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people."

"Society does not consist of individuals but expresses the sum of interrelations, the relations within which these individuals stand."

"The human being is in the most literal sense a political animal, not merely a gregarious animal, but an animal which can individuate itself only in the midst of society."

"The ideas of the ruling class are in every epoch the ruling ideas, i.e., the class which is the ruling material force of society, is at the same time its ruling intellectual force."

"The meaning of peace is the absence of opposition to socialism."

"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."

"The writer must earn money in order to be able to live and to write, but he must by no means live and write for the purpose of making money."