People with schizophrenia often suffer terrifying symptoms such as hearing internal voices not heard by others, or believing that other people are reading their minds, controlling their thoughts, or plotting to harm them. These symptoms may leave them fearful and withdrawn. Their speech and behavior can be so disorganized that they may be incomprehensible or frightening to others. source: http://www.schizophrenia.com/family/sz.overview.htm
That, along with illiteracy and a rich wife, plus seizure disorders, combined with a taste for pedophilia, will get you "prophet" status in 7th Century Arab society....