"Now what is this Guardian Angel? Is it outside of man? It is a part of man's spirit, pertinent to his pneumatology; not the human part but a part of his spiritual being. You can call it the Higher Self, but I prefer to call it the Spiritual Self... man's inmost entity, the Guardian Angel, this spiritual self, is like a god compared with the man of flesh... Compared with his knowledge it has omniscience; compared with his vision it has vision of the past, the present and the future, which three really are but one eternal now in the ever present. This Guardian Angel will always strive and is incessantly striving to guide its wilful errant child, the man of flesh. There is the whole thing in a nutshell, and if you can make your mind pervious to this inner monitor, and follow its mandates, your life will be safe and happy and prosperous."
January 1, 1970
https://en.wikiquote.org/wiki/Higher_self