Art is always and everywhere the secret confession, and at the same time the immortal movement of its time.

Necessity is blind until it becomes conscious. Freedom is the consciousness of necessity.

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

The first requisite for the happiness of the people is the abolition of religion.

Religion is the opium of the masses.

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.

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.

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 country that is more developed industrially only shows, to the less developed, the image of its own future.

Anyone who knows anything of history knows that great social changes are impossible without feminine upheaval. Social progress can be measured exactly by the social position of the fair sex, the ugly ones included.

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 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.

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.

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

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

Capital is reckless of the health or length of life of the laborer, unless under compulsion from society.

History repeats itself, first as tragedy, second as farce.

The history of all previous societies has been the history of class struggles.

Revolutions are the locomotives of history.

The writer may very well serve a movement of history as its mouthpiece, but he cannot of course create it.

It is not history which uses men as a means of achieving - as if it were an individual person - its own ends. History is nothing but the activity of men in pursuit of their ends.

History does nothing; it does not possess immense riches, it does not fight battles. It is men, real, living, who do all this.

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.

We should not say that one man's hour is worth another man's hour, but rather that one man during an hour is worth just as much as another man during an hour. Time is everything, man is nothing: he is at the most time's carcass.

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.

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.

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

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

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