Beyond the senses is the mind; above the mind is its essence; beyond that essence is the great Self; beyond the great Self is the unmanifest.
Beyond the unmanifest is the One—all-pervading and without any blemish whatsoever.—Whom by knowing, a man is liberated and gains eternity.
– Lord Yama to Nachiketa
Then Nachiketa, having gained this knowledge, declared by Death and the whole law of yoga, attained Brahman and became freed from passion and death. And so may any other who knows this knowledge of the Self.