After some time we concluded that Gurdjieff had a peculiar kind of Maya that enabled him to appear differently to different people at the same time. He was, indeed, as Madame Ouspensky had put it, X—the unknown quantity. To convey some impression of his infinite variety forty people, men and women, who saw most of him at the various periods of his life would have to write forty different books. Unfortunately most of those who could have written of him have died, leaving little or no record of their experience.
J.G. Bennett - Witness p.246