Karl Marx

"The concentration of capital increases as the number of capitalists decreases."

"A successful revolution requires the unity of theory and practice."

"The essence of capitalism is the endless accumulation of surplus value."

"In revolutionary periods, the superstructure changes to accommodate new economic realities."

"The intellectual development of workers is essential for their liberation."

"All commodities are nothing but congealed labor-time."

"The struggle between classes is the engine of historical development."

"Self-activity and self-determination are the essence of human freedom."

"The transformation of society begins with a change in consciousness."

"Truth must be established through critical analysis and practical verification."

"The dignity of labor is restored only when workers control the means of production."

"The first premise of all human history is, of course, the existence of living human individuals."

"Men make their own history, but they do not make it as they please."

"The weapon of criticism cannot, of course, replace criticism by the weapon."

"Religion is the sigh of the oppressed creature, the heart of a heartless world."

"Capital is dead labour that, vampire-like, only lives by sucking living labour."

"The point is not to interpret the world, but to change it."

"All that is solid melts into air, all that is holy is profaned."

"The bourgeoisie cannot exist without constantly revolutionizing the instruments of production."

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

"The tradition of all dead generations weighs like a nightmare on the brains of the living."

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

"The more the worker produces, the less he has to consume."

"Production based on capital and wage-labour presupposes a class of workers."

"Knowledge is power, and power is knowledge."

"To be radical is to grasp the root of the matter."

"The human being is in the most literal sense a political animal."

"Ideas are not born; they are made through practice and struggle."

"The class struggle is the moving force of history."

"Society as a whole is more and more splitting up into two great hostile camps."