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It was a matter of showing by what conjunctions a whole set of practices-- from the moment they became coordinated with a regime of truth––was able to make what does not exist (madness, disease, delinquency, sexuality), nonetheless become something, something however that continues not to exist. That is to say, what I would like to show is not how an error––when I say that which does not exist becomes something, this does not mean showing how it is possible for an error to be constructed––or how an illusion could be born, but how a regime of truth and therefore not an error, makes something that does not exist able to become something. It is not an illusion because it is a set of practices, real practices, which establish it and thus imperiously marks it out in reality... The point of all these investigations concerning madness, disease, delinquency, sexuality, and what i am talking about now, is to show how the coupling of a set of practices and a regime of truth from an apparatus (dispotif) of knowledge-power that effectively marks out in reality that which does not exist and legitimately submits it to the division between true and false. In the things I am presently concerned with, the moment when that which does not exist is inscribed in reality, and when that which does not exist comes under a legitimate regime of the true and false, marks the birth of this dissymmetrical bipolarity of politics and the economy. Politics and the economy are not things that exist, or errors, or ideologies. They are things that do not exist and yet which are inscribed in reality and fall under a regime of truth dividing the truth and the false.
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Michel Foucault (Society Must Be Defended: Lectures at the Collège de France, 1975-1976)