It is one of the 19 Upanishads under the Shukla Yajurveda or White Yajurveda. It is classified as a Samanya (non-sectarian) Upanishad. It is also known as Ṭurīyāṭīṭa Avaḍhūṭa Upanishaḍ. The Upanishad expounds on the nature of Brahman. The Adhyatma Upanishad describes the eternal form of Brahman, the unborn (Aja) one who remains within the recess of the heart. His body is represented as the earth (Prithvi), water (Apa), fire(Agni), air (Vayu), ether (Akasha), mind (Manas), intellect (Buddhi), sense of self (Ahamkara), Subconscious mind or memory (chitta), un-manifested (Avyakta), indestructible (Akshara), and Death (Mrityu), all of these elements act within themselves, and within the body without one's awareness. Brahman is then equated with the god Narayana(Vishnu) resides in the soul and cleans everything and washes away all misdeeds. The Adhyatma Upanishad also dwells on the concept of samadhi. The consecutive sequence of benefits of Vairagya (detachment or renunciation) in life leads to bodha (spiritual knowledge) to uparati (restraint of mind); to Shanti, inner calmness achieved through perfect happiness of the mind. Nivṛṭṭi, the inward contemplation will achieve a unique sense of perfect happiness and spirituality. Illusion’s upadhi encompasses the universe.