This atman is not attained by instruction or by intelligence or by learning. By him whom he chooses is the atman attained. To him the atman reveals his own being. The one who has not turned away from wickedness, who has no peace, who is not concentrated, whose mind is restless-he cannot realize the atman, who is known by wisdom.
Krishna Yajur Veda, Katha Upanishad 1.2.24-25. ve, p. 710
He who dwells in the light, yet is other than the light, whom the light does not know, whose body is the light, who controls the light from within — He is the atman within you.
Shukla Yajur Veda, Brihadaranyaka Upanishad 3.7.14. VE, P. 708
With his mind purified, with his consciousness purified, with patience, thinking I am He, and with patience when he has attained the consciousness of I am He, he is established by wisdom in the supreme atman who is to be known in the heart.
Shukla Yajur Veda, Paingala Upanishad 4.9. VE, P. 441
In the Support the worlds consist; in him Creative Fervor and Order have their ground. You I have known, O Support, face to face, in Indra wholly concentrated.
Atharva Veda X, 7, 29
In Indra the worlds consist; in Indra Creative Fervor and Order have their ground. You I have known, O Indra, face to face, in the Support wholly established.
Atharva Veda X, 7, 30
