Chāndogya Upaniṣad 7.11

7.11.1

tejo vāvādbhyo bhūyaḥ \
tad vā etad vāyum āgṛhyākāśam abhitapati tadāhur niśocati nitapati varṣiṣyati vā iti \
teja eva tatpūrvaṃ darśayitvāthāpaḥ sṛjate \
tad etad ūrdhvābhiś ca tiraścībhiś ca vidyudbhir āhrādāś caranti tasmād āhur vidyotate stanayati varṣiṣyati vā iti \
teja eva tatpūrvaṃ darśayitvāthāpaḥ sṛjate \
teja upāssveti \\711.1\

1. ‘Heat (tejas), verily, is more than Water. That, verily, seizes hold of the wind, and heats the ether (ākāśa). Then people say: “It is hot! It is burning hot! Surely it will rain!” Heat indeed first indicates this, and then lets out water. So, with lightnings darting up and across the sky, thunders roll. Therefore people say: “It lightens! It thunders! Surely it will rain!’ Heat indeed first indicates this, and then lets out water. Reverence Heat.

7.11.2

sa yas tejo brahmety upāste \
tejasvī vai sa tejasvato lokān bhāsvato 'pahatatamaskān abhisidhyati \
yāvat tejaso gataṃ tatrāsya yathākāmacāro bhavati yas tejo brahmety upāste \
asti bhagavas tejaso bhūya iti \
tejaso vāva bhūyo 'stīti \
tan me bhagavān bravītv iti \\711.2\

2. He who reverences Heat as Brahma—he, verily, being glowing, attains glowing, shining worlds freed from darkness. As far as Heat goes, so far he has unlimited Freedom, he who reverences Heat as Brahma.’

‘Is there, Sir, more than Heat?’

‘There is, assuredly, more than Heat.’

‘Do you, Sir, tell me it.’