Thelema is a religious philosophy (referred to by some as a religion) that was established, defined and developed by the early 20th century British writer and ceremonial magician, Aleister Crowley. He believed himself to be the prophet of a new age, the Æon of Horus, based upon a religious experience that he had in Egypt in 1904. By his account, a possibly non-corporeal being that called itself Aiwass contacted him and dictated a text known as The Book of the Law or Liber AL vel Legis, which outlined the principles of Thelema. The Thelemic pantheon includes a number of deities, focusing primarily on a trinity of deities adapted from ancient Egyptian religion, who are the three speakers of The Book of the Law: Nuit, Hadit and Ra-Hoor-Khuit. The religion is founded upon the idea that the 20th century marked the beginning of the Aeon of Horus, in which a new ethical code would be followed; "Do what thou wilt shall be the whole of the Law". This statement indicated that adherents, who are known as Thelemites, should seek out and follow their own true path in life, known as their True Will rather than their egoic desires. The philosophy also emphasizes the ritual practice of Magick. The word "Thelema" itself is the English transliteration of the Koine Greek noun θέλημα: "will", from the verb θέλω: to will, wish, purpose. As Crowley developed the religion he wrote widely on the topic, producing what are collectively termed the Holy Books of Thelema. He also included into it ideas from occultism, Yoga and both Eastern and Western mysticism, especially the Qabalah.