If the dead talk to you, you are a spiritualist; if God talks to you, you are a schizophrenic.
Doubt is to certainty as neurosis is to psychosis. The neurotic is in doubt and has fears about persons and things; the psychotic has convictions and makes claims about them. In short, the neurotic has problems, the psychotic has solutions.
Punishment is now unfashionable... because it creates moral distinctions among men, which, to the democratic mind, are odious. We prefer a meaningless collective guilt to a meaningful individual responsibility.
Mental illness, of course, is not literally a 'thing' - or physical object - and hence it can 'exist' only in the same sort of way in which other theoretical concepts exist.