While the finish given to our picture of the world by the theory of relativity has already been absorbed into the general scientific consciousness, this has scarcely occurred to the same extent with those aspects of the general problem of knowledge which have been elucidated by the quantum theory.

No further evidence is needed to show that 'mental illness' is not the name of a biological condition whose nature awaits to be elucidated but is the name of a concept whose purpose is to obscure the obvious.