I have schizoaffective disorder. It's very hard to find motivation for any thing. I've also had his delusion that I was being controlled by demons. I moved on from this delusion with the help of my wife. She altered it by convincing me that she now has the control. That's the trick, people like me need a ground in this reality. Some one to help us see and feel what's real. By my wife's help and her (fake control), I have gone to college and received my degree. I have a job, a 17 yr. Old. And my own house. What I'm suggesting is that you feed his delusion. Pretend hypnotize him, then tell him you undid what he's been hypnotized to do. ( Wife has done this to me under the suggestion of my psychiatrist).