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The Tettairya Upanishad (1/1) also declares:
The Upanishads contain the subtle mystery of the Vedas, therefore they are known as Vedopanishads."
The Upanishads contain an extensive analysis into the nature of Atman (Universal Soul), Brahman (Ultimate Reality) and the world. It is not incorrect to say that the Upanishads are certainly a treasure for seekers of spiritual knowledge. The famous German philosopher Arthur Schopenhauer was deeply influenced by the Upanishads.
He writes:
There is no text other than the Upanishads which is greater in giving peace. The Upanishads are the solace of my life and solace to me in my death.
According to the rishis (sages), who are the spokespersons of Vedanta Wisdom, there is one Omnipresent Truth. This is the Reality out of which the entire creation is manifested and in which all creation is sustained. Through knowledge of this essential Truth, one can obtain immortality. This Truth is variously referred to as Brahman (Ultimate Reality), Atman (Self), and Sat (Truth).
The Aitraiya (1/1/1) and the Brhadaranyaka Upanishad (1/4/1) address this Reality as Ataman:
In the beginning there was only one Atman.
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