The works of Ādi Śaṅkarācārya

Bṛhadāraṇyakopaniṣadbhāṣyam

Bhashya

Bhashya

तथा चक्षुरादित्योऽभवत् ; स तु तपति ॥

In plain words

In this way the eye became the sun, and that sun continues to shine.

Close to the Sanskrit

Thus the eye became the sun; and that [sun] shines.