In Hindu philosophy, turiya (Sanskrit: तुरीय, meaning "the fourth") or chaturiya, chaturtha, is pure consciousness. Turiya is the background that underlies and pervades the three common states of consciousness. The three common states of consciousness are: waking state, dreaming state, and dreamless deep sleep. Mandukya Upanishad Turiya is discussed in Verse 7 of the Mandukya Upanishad; however, the idea is found in the oldest Upanishads. For example, Chapters 8.7 through 8.12 of Chandogya Upanishad discuss the "four states of consciousness" as awake, dream-filled sleep, deep sleep, and beyond deep sleep. Similarly, Brihadaranyaka Upanishad, in chapter 5.14.3 discusses Turiya state, as does Maitri Upanishad in sections 6.19 and 7.11. Verse VII of the Mandukya Upanishad describes Turiya: The insight during meditation of Turiya is known as amātra, the 'immeasurable' or 'measureless' in the Mandukya Upanishad, being synonymous with samādhi in Yoga terminology. Understanding of Turiya Advaita Vedanta Advaita posits three states of consciousness, namely waking (jagrat), dreaming (svapna), deep sleep (suṣupti), which are empirically experienced by human beings, and correspond to the Three Bodies Doctrine: The first state is the waking state, in which we are aware of our daily world. This is the gross body. The second state is the dreaming mind. This is the subtle body. The third state is the state of deep sleep. This is the causal body. Advaita also posits the fourth state of Turiya, which some describe as pure consciousness, the background that underlies and transcends these three common states of consciousness. Turiya is the state of liberation, where according to the Advaita school, one experiences the infinite (ananta) and non-different (advaita/abheda), that is free from the dualistic experience, the state in which ajativada, non-origination, is apprehended. According to Candradhara Sarma, Turiya state is where the foundational Self is realized, it is measureless, neither cause nor effect, all pervading, without suffering, blissful, changeless, self-luminous, real, immanent in all things and transcendent. Those who have experienced the Turiya stage of self-consciousness have reached the pure awareness of their own non-dual Self as one with everyone and everything, for them the knowledge, the knower, the known becomes one, they are the Jivanmukta. Advaita traces the foundation of this ontological theory in more ancient Sanskrit texts. For example, chapters 8.7 through 8.12 of Chandogya Upanishad discuss the "four states of consciousness" as awake, dream-filled sleep, deep sleep, and beyond deep sleep. One of the earliest mentions of Turiya,