The works of Ādi Śaṅkarācārya

Chāndogyopaniṣadbhāṣyam

Verse 284

तदैक्षत बहु स्यां प्रजायेयेति तत्तेजोऽसृजत तत्तेज ऐक्षत बहु स्यां प्रजायेयेति तदपोऽसृजत ।तस्माद्यत्र क्वच शोचति स्वेदते वा पुरुषस्तेजस एव तदध्यापो जायन्ते ॥ ३ ॥

In plain words

That Reality willed: 'May I become many, may I multiply.' And it projected fire. Fire then willed: 'May I become many, may I multiply.' And it projected water. Therefore, whenever a person is distressed or perspires, that moisture is produced solely from heat.

Close to the Sanskrit

That willed: 'May I become many, may I multiply.' That emitted fire. That fire willed: 'May I become many, may I multiply.' That emitted water. Therefore, wherever and whenever a person grieves or sweats, from fire alone that moisture is produced.