" So, when we do experience a non-ordinary state that gives us access to something more, we feel it first as something less—and that something missing is us. Or, more specifically, the inner critic we all come with: our inner Woody Allen, that nagging, defeatist, always-on voice in our heads. You’re too fat. Too skinny. Too smart to be working this job. Too scared to do anything about it. A relentless drumbeat that rings in our ears. This was Silva’s monologue too, but he stumbled onto a curious fact—altered states can silence the nag. They act as an off switch. In these states, we’re no longer trapped by our neurotic selves because the prefrontal cortex, the very part of the brain generating that self, is no longer open for business. "

― Steven Kotler , Stealing Fire: How Silicon Valley, the Navy SEALs, and Maverick Scientists Are Revolutionizing the Way We Live and Work