There is a fantastic book out by neurosurgeon Eben Alexander, M.D. on his Near Death Experience that was caused by a most severe case of bacterial meningitis from e coli. It is fascinating to hear his professional opinion about what was going on in his brain (or actually, what wasn't) while he was in a coma for one week. His description of prayer going up, and it's impression on him while he was in that state is priceless.He also describes Source, angels, and Heaven. Here are some more comments on this fine book, which I recommend highly: http://reikidoc.blogspot.com/2012/12/on-proof-of-heaven-reiki-doc-style.html