The works of Ādi Śaṅkarācārya

Chāndogyopaniṣadbhāṣyam

Bhashya

Bhashya

एवमेव खलु सोम्य तेजसोऽश्यमानस्य योऽणिमा स ऊर्ध्वः समुदीषति सा वाग्भवति ॥

In plain words

In this very way, O gentle one, of the fiery food that is consumed, whatever subtle essence rises upward becomes speech.

Close to the Sanskrit

Even so indeed, O gentle one, of fire being eaten, whichever subtle essence rises upward, that becomes speech.