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.

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

Ideology represents the imaginary relationship of individuals to their real conditions of existence.

Ideology... is indispensable in any society if men are to be formed, transformed and equipped to respond to the demands of their conditions of existence.

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.

In truth, ideology has very little to do with 'consciousness', even supposing this term to have an unambiguous meaning. It is profoundly unconscious, even when it presents itself in a reflected form.

It is characteristic of ideology to impose self-evident facts as self-evident facts.