One of the key ingredients of Tantra is the discovery of atman, or true self.
atman, or Spirit, is held to be an eternal principle, from which the Selves or Souls are differentiated.
For whom else were offerings to be made, who else was to be worshipped but Him, the only one, the atman?
This one essence or Self (atman) permeates the whole Universe.
Was not atman in him, did not the pristine source spring from his heart?
He already knew to feel atman in the depths of his being, indestructible, one with the universe.
No longer, I want to begin my thoughts and my life with atman and with the suffering of the world.
Or may not the atman, the supreme ego, be simply the man in dreamless sleep, in perfect repose?
atman means "breathing;" paramatman "the highest breathing."
But no; for when the body suffers or perishes, atman would perish.
1785, from Sanskrit atma "essence, breath, soul," from PIE *etmen "breath" (a root found in Sanskrit and Germanic, cf. Old English æðm, Dutch adem, Old High German atum "breath," Old English eþian, Dutch ademen "to breathe").