“Fundamental Postulate and its Corollaries”

"Gurdjieff" in Man, Myth and Magic : Encyclopedia of the Supernatural (1970) http://www.gurdjieff.org/travers1.htm
Context: It is clear from Gurdjieff's writings that hypnotism, mesmerism and various arcane methods of expanding consciousness must have played a large part in the studies of the Seekers of Truth. None of these processes, however, is to be thought of as having any bearing on what is called Black Magic, which, according to Gurdjieff, "has always one definite characteristic. It is the tendency to use people for some, even the best of aims, without their knowledge and understanding, either by producing in them faith and infatuation or by acting upon them through fear. There is, in fact, neither red, green nor yellow magic. There is "doing." Only "doing" is magic." Properly to realise the scale of what Gurdjieff meant by magic, one has to remember his continually repeated aphorism, "Only he who can be can do," and its corollary that, lacking this fundamental verb, nothing is "done," things simply "happen."

Interview in 'The Observer' (25 January 1931), p.17, column 3

Session 410, Page 284
The Early Sessions: Sessions 1-42, 1997, The Early Sessions: Book 8

The Unbearable Lightness of Being (1984), as quoted in Milan Kundera (2003) by Harold Bloom, [//books.google.it/books?id=SXDojRJFMPIC&pg=PA91 p. 91]
Context: True human goodness, in all its purity and freedom, can come to the fore only when its recipient has no power. Mankind's true moral test, its fundamental test (which lies deeply buried from view), consists of its attitude toward those who are at its mercy: animals. And in this respect mankind has suffered a fundamental debacle, a debacle so fundamental that all others stem from it.

or briefly, world-postulate
Space and Time (1909), Tr. Ganesh Prasad in: Bulletin of the Calcutta

1910's, Natural Reality and Abstract Reality', 1919

Source: Economic Control of Quality of Manufactured Product,1931, p. 8

In a letter dated 4th April, 1952 to Dr. Zahid Husain, President of Arabiyyah Jamiyyat, Karachi.
Context: Islam is fundamentally in its very nature a natural religion. Throughout the Quran God's signs (Ayats) are referred to as the natural phenomenon, the law and order of the universe, the exactitudes and consequences of the relations between natural phenomenon in cause and effect. Over and over, the stars, sun, moon, earthquakes, fruits of the earth and trees are mentioned as the signs of divine power, divine law and divine order. Even in the Ayeh of Noor, divine is referred to as the natural phenomenon of light and even references are made to the fruit of the earth. During the great period of Islam, Muslims did not forget these principles of their religion.

Source: The Social Principles of Jesus (1918), p. 127