I get papers cited at me, (the first is about "religion and spirituality", the rest about specific meditation disciplines) about but I can't tell whether they're well-done or not. I believe LessWrong is the ideal place to ask about this because there's a healthy combination of interest for self-improvement techniques and solid skepticism against quackery. I thought it would be a solid enough topic to merit its own thread rather than a discussion in Open Thread.
What exactly do you mean with "insanity"? Do you mean schizophrenia?
Good question. The first article allegedly argues for the merits of religion/spirituality) in psychotherapy, but it doesn't seem to say anything about any specific illness (or religion, for that matter). The research it cites is, I find, weak and inconclusive, and its conclusions are so tentative as to be utterly worthless. It's proving to be a very frustrating read.
The articles about meditative practice cite depression specifically, among others, though.