Mahabharata 14.21.4

ततो वाचस्पतिर्जज्ञे समानः पर्यवेक्षतेरूपं भवति वै व्यक्तं तदनुद्रवते मनः

tato vācaspatirjajñe samānaḥ paryavekṣaterūpaṃ bhavati vai vyaktaṃ tadanudravate manaḥ

Our plain-language meaning of this verse is waiting for scholar review.