The Kybalion (full title: The Kybalion: A Study of the Hermetic Philosophy of Ancient Egypt and Greece) is a book originally published in 1908 by "Three Initiates" (often identified as the New Thought pioneer William Walker Atkinson, 1862–1932) that purports to convey the teachings of Hermes Trismegistus. It shares with ancient and medieval Hermetic texts a number of traits such as philosophical mentalism, the concept of 'as above, so below', and the idea that everything consists of gendered polar opposites. A modern Hermetic tract, it has been widely influential in New Age circles since the twentieth century.