Maitrāyaṇīya Āraṇyaka 7.10

like a trick of magic. Therefore, what is declared in the Vedas is the truth; on what is spoken in the Vedas the wise live. Therefore a Brahmin should not study non-Vedic [texts]; this should be the purpose.

This indeed is the true form of the space inside the ether: the supreme splendor. It is declared threefold: in fire,

in the sun, and in the vital breath. This indeed is the true form of the space inside the ether, namely the syllable Oṃ.

By this alone it awakens, rises, breathes out—an incessant support for the meditation on Brahman. Or here indeed

it takes the place of illumination, projection, and heat in the wind. Just as smoke rises into the windy space

with a branch-like [plume] and follows from branch to branch, or as [salt] thrown into water [pervades], like the warmth

of ghee, like the expansion of one who contemplates. On this they cite: Now,

why is it called "the lightning-like"?

Because, as soon as it is uttered, it illumines the whole body.

Therefore, through this [syllable] Oṃ, one should venerate this boundless splendor.

The person in the eye who resides in the right eye,

this is Indra; his wife resides in the left eye.

Their union takes place inside the cavity of the heart;

the splendor thereof is indeed the mass of blood of them both.

Extending from the heart, it is established in the eye;

that channel is their pathway, being one for the two, divided into two.

The mind strikes the fire of the body; that impels the wind;

and the wind moving in the chest produces a low murmur.

United in the heart by the union of ether-born fire, it is an atom of an atom; in the throat it is a double atom;

and know that at the tip of the tongue it is a triple atom. Emerged [from the mouth], they call it the alphabet.

"Seeing, he sees not death, nor disease, nor sorrow;

seeing, he sees everything, and attains everything everywhere."