[Mentalism] - The ALL is Mind. The Universe is Mental.

This Principle embodies the truth that “All is Mind.“ It explains that THE ALL (which is the Substantial Reality underlying all the outward manifestations and appearances which we know under the terms of “The Material Universe“; the “Phenomena of Life“; “Matter“; “Energy“; and, in short, all that is apparent to our material senses) is SPIRIT which in itself is UNKNOWABLE and UNDEFINABLE, but which may be considered and thought of as AN UNIVERSAL, INFINITE, LIVING MIND. The Three Initiates. Kybalion: A Study of the Hermetic Philosophy of Ancient Egypt and Greece (pp. 20-21). Neeland Media LLC. Kindle Edition.