The marvellous logic of the mad which seems to mock that of the logicians because it resembles it so exactly, or rather because it is exactly the same, and because at the secret heart of madness, at the core of so many errors, so many absurdities, so many words and gestures without consequence, we discover, finally, the hidden perfection of a language.
Michel Foucault, Madness and Civilization: A History of Insanity in the Age of Reason
madness