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 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.

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.

Relations of production are first reproduced by the materiality of the processes of production and circulation. But it should not be forgotten that ideological relations are immediately present in these same processes.

However much an ideologue tries to bury [Lenin] beneath a proof by historical analysis, there is always this one man standing their on the plain of History and of our lives, in the eternal 'current situation.' He goes on talking, calmly or passionately. He goes on talking about something simple: his revolutionary practice, the practice of class struggle, about what makes it possible to act on history...not to demonstrate that revolutions are inevitable, but to make them in our unique present.

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

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