To philosophize with open eyes is to philosophize in the dark. Only the blind can look straight at the sun.

Philosophy is, in the last instance, class struggle in the field of theory.

Without claiming to be exhaustive, I maintain that every philosophy reproduces within itself, in one way or another, the conflict in which it finds itself compromised and caught up in the outside world.

The rejection of all abstract formalism. Materialism reminds every science of its real source: the world men transform. No science can, whether in its history or its object, grasp its own origins within itself or constitute itself as a closed world, exhaustively defined by internal rules. Materialism refers every science and every activity to the reality they depend on, even if this dependence is masked by a great many abstract mediations: mathematics as well as logic, aesthetics as well as ethics and politics.

If someone asks, ‘But what in the end is a philosopher?’ I would say ‘A philosopher is a human being who fights in theory.’

The ultimate condition of production is therefore the reproduction of the conditions of production

One of the goals of philosophy is wage theoretical battle. That is why we can say that every thesis is always, by its very nature, an antithesis. A thesis is only ever put forward in opposition to another thesis, or in defence of a new one.