William James, The Principles of Psychology, Volume 1…
“ No material agent could thus turn round and grasp itself—material activities always grasp something else than the agent. And if a brain could grasp itself and be self-conscious, it would be conscious of itself as a brain and not as something of an altogether different kind. The Soul then exists as a simple spiritual substance in which the various psychic faculties, operations, and affections inhere. ”
