Kauṣītaki Upaniṣad 4.8

4.8.1

sa hovāca bālākir ya evaiṣa vāyau puruṣas tam evāham upāsa iti /

Bâlâki said: 'The person that is in the air, on him I meditate.'
Agâtasatru said to him: 'Do not challenge me on this. I meditate on him as Indra Vaikuntha, as the unconquerable army. Whoso meditates on him thus, becomes victorious, unconquerable, conquering his enemies.'

4.8.2

taṃ hovācājātaśatrur mā maitasmin saṃvādayiṣṭhāḥ /

4.8.3

indro vaikuṇṭho 'parājitā seneti vā aham etam upāsa iti /

4.8.4

sa yo haitam evam upāste jiṣṇur ha vā aparājayiṣṇur anyatastyajāyī bhavati //8//