The Mukhya Upaniṣads

Kauṣītaki · Adhyāya 4 · Kauṣītaki 4.1

Passage 5

स होवाच बालाकिर्य एवैष स्तनयित्नौ पुरुषस्तमेवाहमुपास इति तं होवाचाजातशत्रुर्मा मैतस्मिन्समवादयिष्ठाः शब्दस्यात्मेति वा अहमेतमुपास इति स यो हैतमेवमुपास्ते शब्दस्यात्मा भवति ॥ ५ ॥

In plain words

Bālāki said, "The person who is in the thunder — him indeed I worship." Ajātaśatru said to him, "Do not draw me into talk about him. I worship him as the self of sound." He who worships him thus becomes the self of sound.