abraham afterlife aperspectival approaches beyond biology blackmore brains campbell chaos classic consciousness cosmic creativity culture dalai lama death dialogues ego emergence experience field guide flow gebser goerner grof history horgan houston huston institute integral james journey journeys jung laberge lancaster leland maslow mckenna meditation mihaly mind monroe mysticism mystics nde near-death nonphysical obe origin otherwhere parapsychology passion paths phenomena psychedelics psychology rational reality reference religion religious science sheldrake shulgin smith society systems tarnas tart transpersonal traveler universe varieties vision western wilber william worldview