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.
Thomas SzaszThe many faces of intimacy: the Victorians could experience it through correspondence, but not through cohabitation; contemporary men and women can experience it through fornication, but not through friendship.
Thomas Szasz