VII Turiya is not that which is conscious of the inner (subjective) world, nor that which is conscious of the outer (objective) world, nor that which is conscious of both, nor that which is a mass of consciousness. It is not simple consciousness nor is It unconsciousness. It is unperceived, unrelated, incomprehensible, uninferable, unthinkable and indescribable. The essence of the Consciousness manifesting as the self in the three states, It is the cessation of all phenomena; It is all peace, all bliss and non—dual. This is what is known as the Fourth (Turiya). This is Atman and this has to be realized.
10 Turiya, the changeless Ruler, is capable of destroying all miseries. All other entities being unreal, the non—dual Turiya alone is known as effulgent and all—pervading.
11 Visva and Taijasa are conditioned by cause and effect. Prajna is conditioned by cause alone. Neither cause nor effect exists in Turiya.
12 Prajna does not know anything of self or non—self, of truth or untruth. But Turiya is ever existent and all—seeing.
13 Non—cognition of duality is common to both Prajna and Turiya. But Prajna is associated with sleep in the form of cause and this sleep does not exist in Turiya.
14 The first two, Visva and Taijasa, are associated with dreaming and sleep respectively; Prajna, with Sleep bereft of dreams. Knowers of Brahman see neither sleep nor dreams in Turiya.
15 Dreaming is the wrong cognition and sleep the non—cognition, of Reality. When the erroneous knowledge in these two is destroyed, Turiya is realized.
16 When the jiva, asleep under the influence of beginningless maya, is awakened, it then realizes birthless, sleepless and dreamless Non—duality.
17 If the phenomenal universe were real, then certainly it would disappear. The universe of duality which is cognized is mere illusion (maya); Non—duality alone is the Supreme Reality.
18 If anyone imagines illusory ideas such as the teacher, the taught and the scriptures, then they will disappear. These ideas are for the purpose of instruction. Duality ceases to exist when Reality is known.
XII The Fourth (Turiya) is without parts and without relationship; It is the cessation of phenomena; It is all good and non—dual. This AUM is verily Atman. He who knows this merges his self in Atman—yea, he who knows this.
The Mandukya Upanishad is the shortest of the Upanishads – the scriptures of Hindu Vedanta. It is in prose, consisting of just twelve verses expounding the mystic syllable Aum, the three psychological states of waking, dreaming and deep sleep, and the transcendent fourth state of illumination. The Muktikopanishad, which discusses other Upanishads, says that the Mandukya Upanishad alone is enough for salvation.
Gaudapadacharya was the author of M???ukya K?rik?, a commentary on Mandukya Upanishad. It was written in 8th century, and is one of the earliest works on Advaita Vedanta.
Turiya is not a state. It is the background on which dream and wake arises and disappears. It is another term to describe pure awareness, which is also called nirvikalpa,[web 6] without conceptualisation. The insight during meditation of Turiya is known as am?tra, the ‘immeasurable’ or ‘measureless’ in the Mandukya Upanishad, being synonymous to sam?dhi in Yoga terminology.
Goldberg, Ellen (2002). Ardhanarishvara: The Lord who is Half Woman, p. 85