«What must I be, I who think and who am my thought, in order to be what I do not think, in order for my thought to be what I am not? What is this being, then, that shimmers and, as it were, glitters in the opening of the cogito, yet is not sovereignly given in it or by it? What, then, is the connection, the difficult link, between being and thought?»

Foucault, 'Order of Things'