The works of Ādi Śaṅkarācārya

Bṛhadāraṇyakopaniṣadbhāṣyam

Verse 5

तस्य श्रान्तस्य तप्तस्य यशो वीर्यमुदक्रा-मत् ।प्राणा वै यशो वीर्यं तत्प्राणेषू-त्क्रान्तेषु शरीरं श्वयितुमध्रियत तस्यशरीर एव मन आसीत् ॥ ६ ॥

In plain words

From Prajāpati, exhausted and heated by his intense creation, his radiance and vital energy departed. These vital breaths are indeed glory and strength; when they departed from him, his physical body began to swell. Yet within that swelling body, the mind alone remained.

Close to the Sanskrit

Of him who was exhausted and heated, glory and energy departed. The vital breaths indeed are glory and energy; when those vital breaths had departed, the body tended to swell. Within that body alone the mind remained.