Mahabharata 7.118.18

सूर्ये चक्षुः समाधाय प्रसन्नं सलिले मनःध्यायन्महोपनिषदं योगयुक्तोऽभवन्मुनिः

sūrye cakṣuḥ samādhāya prasannaṃ salile manaḥdhyāyanmahopaniṣadaṃ yogayukto'bhavanmuniḥ

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