Muṇḍaka Upaniṣad 3.1.2

3.1.2

samāne vṛkṣe puruṣo nimagno 'nīśayā śocati muhyamānaḥ.
juṣṭaṃ yadā paśyaty anyam īśam asya mahimānam iti vītaśokaḥ.

2. On the self-same tree a person, sunken,
Grieves for his impotence, deluded;
When he sees the other, the Lord (īś), contented,
And his greatness, he becomes freed from sorrow.