So psychosis is both genetic and environmental genetics is thought to be anywhere between 30-80% I think depending on the study and the rest is your environment. As far as open mindedness this sounds more like philosophy than psychosis. Are you prone to it seriously not even a pdoc could tell you that we just don't know enough about how it works but some people have a brief episode and recover entirely. It's not like there are really preventative actions to take except to stay away from street drugs or stimulants and try to be more relaxed in your approach to life...