The causal body, originally Karana-Sarira, is a yogic and Vedantic concept that was adopted and modified by Theosophy and from the latter made its way into the general New Age movement and contemporary Western esotericism.
[3][note 1] Ramanuja concludes that it is at this stage that consummation of the atman with the Paramatman is reached and the search of the highest Purusa i.e. of Ishvara ends.
[4] The Indian tradition identifies it with the Anandamaya kosha,[web 1] and the deep sleep state, as mentioned in the Mandukya Upanishad, where buddhi becomes dormant and all concepts of time fail, although there differences between these three descriptions.
In Blavatsky's synthesis of eastern philosophy with Western esotericism, the union of the higher Manas with the Buddhi (i.e. the essential nature of the fifth, along with the sixth, of the seven principles) is referred to as the Causal Body.
In the tradition of Samael Aun Weor, it is taught that most people have only incarnated a fraction of the causal body or human soul.