Friedrich Engels — "The first condition of all freedom is not to be a slave."

"Freedom does not consist in any dreamt-of independence from natural laws, but in the knowledge of these laws, and in the possibility, therefore, of putting them to work purposefully for definite ends."

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

"Only the proletariat, by abolishing private property itself, will be able to emancipate itself and thereby all other classes of society."

"The condition for the emancipation of the working class is the abolition of all classes."

"The more the economic conditions of society are subjected to the control of the individual, the more will the individual be free."