Māṇdūkya Upaniṣad 3.1.4

For he is the Breath shining forth in all beings, and he who understands this becomes truly wise, not a talker only. He revels in the Self, he delights in the Self, and having performed his works (truthfulness, penance, meditation, &c.) he rests, firmly established in Brahman, the best of those who know Brahman.