The Kybalion

The Kybalion (1908), published under the pseudonym "Three Initiates" and almost universally attributed by scholars to the prolific New Thought writer William Walker Atkinson, presents itself as a distillation of an ancient Hermetic oral tradition descended from Hermes Trismegistus. Modern researchers generally regard it instead as an early-twentieth-century synthesis of New Thought psychology clothed in Hermetic language rather than a genuine antique source.

Its central claim is the Principle of Mentalism: "The All is Mind; the Universe is Mental." From this premise the work elaborates seven principles, including Correspondence ("as above, so below"), Vibration ("everything moves; everything vibrates"), and Mental Transmutation, the contention that deliberate application of these laws can change one's mental state and thereby one's conditions. Packaged in an accessible, aphoristic style, these formulas reduced complex esoteric ideas to memorable axioms.

Whatever its disputed provenance, the book became one of the most influential occult primers of the modern era and a crucial bridge between nineteenth-century New Thought and the later manifestation and "law of attraction" movements. Its vibrational vocabulary, in particular, anticipates much contemporary "raise your frequency" rhetoric, and its ideas were absorbed by countless later teachers, often without acknowledgment of the source.