The main document of the International Nath Order consists of three manuscripts combined with the title of the Twilight Yoga Trilogy. Twilight Yoga is a term which embodies all of Shri Gurudev Mahendranath’s personal teachings and expressed as a yoga. The Twilight Yoga Trilogy contains the manuscripts of Ecstasy, Equipoise, and Eternity; The Magnum Opus; and Esoterikos Orgia Mysterion. The first manuscript contains all that is known and reliable of the ancient Nath tradition and the life of Shri Dattatreya, and the four key words to a way of life which has been preserved and remembered for several thousand years.