the Enneagram is a Universal Symbol

"Speaking in general it must be understood that the enneagram is a universal symbol. All knowledge can be included in the enneagram and with the help of the enneagram it can be interpreted."

"The knowledge of the enneagram has for a very long time been preserved in secret and if it now is, so to speak, made available to all, it is only in an incomplete and theoretical form of which nobody could make any practical use without instruction from a man who knows."

G.I. Gurdjieff

Fourth Way Enneagram Literature:

P.D. Ouspensky - In Search of the Miraculous

J.G. Bennett - Enneagram Studies

Anthony Blake - The Intelligent Enneagram

Steffan Soule - Accomplish the Impossible

Russell A. Smith - Gurdjieff: Cosmic Secrets

Sophia Wellbeloved - Gurdjieff: The Key Concepts

Dr. H.J. Sharp - Sacred Geometry and the Enneagram

Richard J. Defouw - The Enneagram in the Writings of Gurdjieff

William Patrick Patterson - Taking With the Left Hand: Enneagram Craze