Maitrayaniya Upanishad 7.10.p1

7.10.p1

etadvā va tatsvarūpaṃ nabhasaḥ khe'ntarbhūtasya yatparaṃ tejastattredhābhihitamagnā āditye prāṇa etadvā va tatsvarūpaṃ nabhasaḥ khe'ntarbhūtasya yadomityetadakṣaramanenaiva tadudbudhnyati udayati ucchvasati ajasraṃ brahmadhīyālambaṃ vātraivaitatsamīraṇe nabhasi prasākhayaivotkramya skadhātskandhamanusartyapsu prakṣepako lavaṇasyeva ghṛtasya cauṣṇyamivābhidhyāturvistṛtirivaitadityātrodāharanti atha kasmāducyate vaidyuto yasmāduccāritamātra eva sarvaṃ śarīraṃ vidyotayati tasmādomityanenaitadupāsītāparimitaṃ tejaḥ |
1 puruṣaścakṣuṣo yo'yaṃ dakṣiṇo'kṣiṇyavasthitaḥ |
indro'yamasya jāyeyaṃ savye cākṣiṇyavasthitā ||

11. Assuredly, the nature of the ether within the space [of the heart] is the same as the supreme bright power. This has been manifested in threefold wise: in fire, in the sun, and in the breath of life.

Verily, the nature of the ether within the space [of the heart] is the same as the syllable Om.

With this [syllable], indeed, that [bright power] is raised up from the depths, goes upwards, and is breathed forth. Verily, therein is a perpetual support for meditation upon Brahma.

In the stirring up, that [bright power] has its place in the heat that casts forth light. In the stirring up, that is like [the action] of smoke; it rises up into a great tree in the sky, issuing forth into one branch after another.

That is like the casting forth of salt into water, like the heat in melted butter, like the range [of the thought] of a meditator [i. e. all-pervading].

On this point they quote: ‘Now, wherefore is it said to be like lightning? Because in the very moment of going forth it lights up the whole body.’

Therefore, one should reverence with Om that unlimited bright power.

(1) This Person who is in the eye,
Who has his place in the right eye—
This one is Indra; this, his wife,
Who has her place in the left eye.
(2) The meeting-place of these two is
Within the hollow of the heart.
The lump of blood which is therein
Is the life-vigor of these two.