"The whole of human history is a process of development from the lower to the higher, from the simple to the complex."

"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 modern individual is a product of social relations, not an isolated atom."

"The abolition of private property is therefore by no means the result of an arbitrary act of will, but the necessary result of the development of the productive forces."

"The working class is revolutionary or it is nothing."