Mandukya Upanishad is one of the shortest Upanishads and explains the significance of
Below is the English Translation of Mandukya Upanishad.
1. All this is the letter
2. All this is certainly Brahman. This Self is Brahman. This Self, as such, is possessed of four quarters.
3. (The Self) seated in the waking state and called Vaisvanara who, possessed of the consciousness of the exterior, and seven limbs and nineteen mouths, enjoys the gross objects, is the first quarter.
4. (The Self) seated in the state of dream and called Taijasa who, possessed of the consciousness of the interior, and seven limbs and nineteen mouths, enjoys the subtle objects, is the second quarter.
5. Where the sleeper desires not a thing of enjoyment and sees not any dream, that state is deep sleep. (The Self) seated in the state of deep sleep and called Prajna, in whom everything is unified, who is dense with consciousness, who is full of bliss, who is certainly the enjoyer of bliss, and who is the door to the knowledge (of the preceding two states), is the third quarter.
6. This is the Lord of all; this is omniscient; this is the in-dwelling controller (of all); this is the source and indeed the origin and dissolution of all beings.
7. The Fourth is thought of as that which is not conscious of the internal world, nor conscious of the external world, nor conscious of both the worlds, nor dense with consciousness, nor simple consciousness, nor unconsciousness, which is unseen, actionless, incomprehensible, unthinkable, indescribable, whose proof consists in the identity of the Self (in all states), in which all phenomena come to a cessation, and which is unchanging, auspicious, and non-dual. That is the Self; that is to be known.
8. That same Self, from the point of view of the syllable, is
9. Vaisvanara seated in the waking state is the first letter a, owing to its all-pervasiveness or being the first. He who knows thus verily accomplishes all longings and becomes the first.
10. Taijasa seated in the dream is u, the second letter (of
11. Prajna seated in the state of deep sleep is m, the third letter (of
12. That which is without letters (parts) is the Fourth, beyond apprehension through ordinary means, the cessation of the phenomenal world, the auspicious and the non-dual. Thus
Here ends the Mandukya Upanishad, as contained in the Atharva Veda.