"The creation has come into existence from the Prana, universal energy. The Aum sound is known as Pranava, because it is the first sound of creation. The Aum sound contains three syllables: ‘A’, ‘U’ and ‘M’. The ‘A sound corresponds to the conscious state. The ‘U’ sound corresponds to the subconscious state, and the ‘M’ sound to the unconscious state. When the Aum sound is repeated constantly with elongated ‘A’, ‘U’ and ‘M’ sounds, the three states of consciousness, waking, dreaming and sleeping, or conscious, subconscious and unconscious, are systematically awakened. All the karmas, or actions, which one has done in this birth and previous births remain in seed form in the deeper consciousness. Aum, being the first sound, is the purest vibration. When this sound vibrates throughout the consciousness, it neutralizes and roots out all the karmas stored in the deeper layers of the consciousness." Yoga Tattwa Upanishad, by Swami Satyadharma.