I remember reading somewhere that schizophrenia can be more positive than negative, depending on the social-cultural surroundings. It said something about people in some Hindu or Indian cultures with schizophrenia having positive voices rather than criticism. To add up, basically all particular cases I have read on schizophrenia appeared after stressful events, from one more emotional or several different "adding up"
That is interesting, I read about positive voices as well.