Joseph Joubert

Descartes. His imaginary world is not an imaginable world. In it the mind finds matter everywhere, and figures rather than form. (For the form is the figure of the figure, and the figure is the body of the form, the form is the exterior soul of a body.) Descartes has thus made the imagination do what it does not like to do. He has made it arrange stones. It wants to be an architect: he has restricted it to being a mason.