The chief function of the disciplinary power is to 'train', rather than to select and to levy; or, no doubt, to train in order to levy and select all… - Michel Foucault

All those movements which took place in the fifteenth and sixteenth centuries and which had the Reformation as their main expression and result should be analyzed as a great crisis of the Western experience of subjectivity and a revolt against the kind of religious and moral power which gave form, during the Middle Ages, to this subjectivity. The need to take a direct part in spiritual life, in the work of salvation, in the truth which lies in the Book—all that was a struggle for a new subjectivity.

A great prison structure was planned, whose different levels would correspond exactly to the levels of the centralized administration. The scaffold, where the body of the tortured criminal had been exposed to the ritually manifested force of the sovereign, the punitive theatre in which the representation of punishment was permanently available to the social body, was replaced by a great enclosed, complex and hierarchized structure that was integrated into the very body of the state apparatus.

To say that madness is dazzlement is to say that the madman sees the day, the same day that rational men see, as both live in the same light, but that when looking at that very light, nothing else and nothing in it, he sees it as nothing but emptiness, night and nothingness. Darkness for him is another way of seeing the day. Which means that in looking at the night and the nothingness of the night, he does not see at all. And that in the belief that he sees, he allows the fantasies of his imagination and the people of his nights to come to him as realities. For that reason, delirium and dazzlement exist in a relation that is the essence of madness, just as truth and clarity, in their fundamental relation, are constitutive of classical reason.
In that sense, the Cartesian progression of doubt is clearly the great exorcism of madness. Descartes closes his eyes and ears the better to see the true light of the essential day, thereby ensuring that he will not suffer the dazzlement of the mad, who open their eyes and only see night, and not seeing at all, believe that they see things when they imagine them. In the uniform clarity of his closed senses, Descartes has broken with all possible fascination, and if he sees, he knows he really sees what he is seeing. Whereas in the madman's gaze, drunk on the light that is night, images rise up and multiply, beyond any possible self-criticism, since the madman sees them, but irremediably separated from being, since the madman sees nothing.
Unreason is to reason as dazzlement is to daylight.