Diesel Potato stated: source post
hahahahaha Happiness is not determined by brain chemistry? Happiness is brain chemistry.
Brain chemistry and inner workings can be changed to a big degree. What you are telling yourself, by forcing yourself to think in a certain way, changes the brain chemistry. It is mental training. It is how people get indoctrinated into stuff, influenced to do things they would have never done on their own, often just through words. Your way of thinking, feeling and experiencing life can be shaped.
If we are talking strictly organic disease then yeah there is less you can do. I mean a stroke or something. Turncoat has issues with motivation and finding happiness though, and I do know these can be changed or at least influenced.
I don't think anyone pretended hallucinations and psychosis could be cured through mental conditioning, but I also doubt they are as bad as Turncoat makes them appear. He seems pretty functional to me. Severe illness leaks through, see MrOmega's posts. You could tell that guy had real mental problems.