“The history of all hitherto existing society is the history of class struggles.Freeman and slave, patrician and plebeian, lord and serf, guildmaster and journeyman, in a word, oppressor and oppressed, stood in constant opposition to one another, carried on an uninterrupted, now hidden, now open fight, that each time ended, either in the revolutionary reconstitution of society at large, or in the common ruin of the contending classes.”

“The 'Manifesto' being our joint production, I consider myself bound to state that the fundamental proposition which forms its nucleus belongs to Marx. That proposition is: that in every historical epoch, the prevailing mode of economic production and exchange, and the social organization necessarily following from it, form the basis upon which is built up, and from which alone can be explained, the political and intellectual history of that epoch; that consequently the whole history of mankind (since the dissolution of primitive tribal society, holding land in common ownership) has been a history of class struggles, contests between exploiting and exploited, ruling and oppressed classes; that the history of these class struggles forms a series of evolution in which, nowadays, a stage has been reached where the exploited and the oppressed class—the proletariat—cannot attain its emancipation from the sway of the exploiting and ruling class—the bourgeoisie—without, at the same time, and once for all, emancipating society at large from all exploitation, oppression, class distinctions and class struggles.This proposition, which, in my opinion, is destined to do for history what Darwin's theory has done for biology, we, both of us, had been gradually approaching for some years before 1845.”

“The modern bourgeois society that has sprouted from the ruins of feudal society has not done away with class antagonisms. It has but established new classes, new conditions of oppression, new forms of struggle in place of the old ones.”

“There will always be new opposites, class struggles and uprisings. History has no ending.”

“There exists [a] word in German, Geschichte, which designates not accomplished history, but history in the present, doubtless determined in large part, yet only in part, by the already accomplished past; for a history which is present, which is living, is also open to a future that is uncertain, unforeseeable, not yet accomplished, and therefore aleatory. Living history obeys only a constant (not a law): the constant of class struggle. Marx did not use the term 'constant', which I have taken from Levi-Strauss, but an expression of genius: 'tendential law', capable of inflecting (but not contradicting) the primary tendential law, which means that a tendency does not possess the form or figure of linear law, but that it can bifurcate under the impact of an encounter with another tendency, and so on ad infinitum. At each intersection the tendency can take a path that is unforeseeable because it is aleatory.”

“The churches failed to realize that the working-class movement was the movement of the humiliated and oppressed supplicating for justice. They did not choose to work with and for them to create the kingdom of God on earth. By siding with the oppressors, they deprived the working-class movement of God. And now they reproach it for being godless. The Pharisees!”