"Cosmic Consciousness", 1968 Written by Richard Murice Bucke
 
Cosmic Consciousness: A Study in the Evolution of the Human Mind is Richard Bucke's theory that our mental states are evolving and that to date we have experienced three stages in the development of consciousness: the 'simple consciousness' of animals, the 'self-consciousness' of the vast majority of humans (reason, self awareness, imagination, etc.), and in some cases 'cosmic consciousness'; a mystical state of being beyond 'self consciousness' and the next stage of human development.