" … the several sub-types of mental illness should be functioning on this world as classes somewhat like those of ancient India. These people here, the hebephrenics, would be equivalent to the untouchables[*]. The maniacs would be the warrior class, without fear; one of the highest.
…
… The paranoids – actually paranoiac schizophrenics – would function as the statesman class; they’d be in charge of developing political ideology and social programs – they’d have the overall world view. The simple schizophrenics (…) [would] correspond to the poet class, although some of them would be religious visionaries – as would be some of the Heebs. The Heebs, however, would be inclined to produce ascetic saints, whereas the schizophrenics would produce dogmatists. Those with polymorphic schizophrenia simplex would be the creative members of the society, producing the new ideas. (…) There could be some with over-valent ideas, psychotic disorders that were advanced forms of milder obsessive-compulsive neurosis, the so-called diencephalic disturbances. Those people would be the clerks and office holders of the society, the ritualistic functionaries, with no original ideas. Their conservatism would balance the radical quality of the polymorphic schizophrenics and give the society stability. "

― Philip K. Dick , Clans of the Alphane Moon