I've had a few manic episodes and the tendency seems to be that they feel very spiritual. The cause of it's all chemical and actually an imbalance; people weren't meant to become psychotic. Bipolar people have the interesting condition of actually feeling "too good" sometimes, and so instead of seeing the manias as the disorder that they really are, we can cling on to the good parts of them.

Whenever I try to explain psychosis to people who have never experienced it, I usually explain it as "dreaming while you're awake". You are very much awake, but you have no control over your mental faculties. And as such, you float around doing things that may or may not be rational. That's the long and short of what psychosis is, no more, no less.

When I came out of the few years that I experienced psychosis it led to a lot of spiritual activity on my part, but all along the while I had intense social anxiety that was a condition of not properly treating and dealing with my bipolar, while I focused on this "spirituality". Once I finally got my medications worked out, I strangely felt stable, not paranoid, and capable of existing in society on a day to day basis, having great relationships and great experiences. That has been a greater spiritual experience than anything psychosis has ever offered me.