Māndūkya Upanishad is the shortest of the Upanishads - the scriptures of Hindu Vedanta. It is in prose, consisting of twelve verses expounding the mystic syllable Aum, the three psychological states of waking, dreaming and sleeping, and the transcendent fourth state of illumination. This Upanishad has been greatly extolled. The Muktikopanishad, which talks about all other Upanishads, says that the Māndūkya Upanishad alone will be enough for the salvation. According to Dr.Sardar Vallabhbhai Patel it contains the fundamental approach to reality.