Idiosyncrasy - This refers to speech or thoughts that seem random, clearly not related to other current conversation or thought content. Delusions are false beliefs that are irrational and resist refutation. They probably arise from thought disorder. Also, delusions can range from simple, isolated beliefs to eloborate systems of belief, which, although based on delusional premises, can be reasonably internally consistent. There are a variety of delusions.
Delusions are about the person s own experience, reflecting culture and the times.
The content of delusions reflects this. Indeed, the experience of the schizophrenic is different, and like everyone else, they seek to understand this. Childhood onset is rare, but does happen. Also, it unusual to present with initial symptoms after age 40. Bleuler described a chronic, but cyclic, course in which symptoms wax and wane but do not become more severe.