याज्ञवल्क्येति होवाच यदिदं सर्वमहोरात्राभ्यामाप्तं सर्वमहोरात्राभ्यामभिपन्नं केन यजमानोऽहोरात्रयोराप्तिमतिमुच्यत इति ।अध्वर्युणर्त्विजा चक्षुषादित्येन ।चक्षुर्वै यज्ञस्याध्वर्युः ।तद्यदिदं चक्षुः सोऽसावादित्यः ।सोऽध्वर्युः सा मुक्तिः सातिमुक्तिः ॥३,१.४ ॥
In plain words
"Yājñavalkya," he said, "since all this is overtaken by day and night and beset by day and night, by what means is the sacrificer freed from the reach of day and night?" "By the Adhvaryu priest, by the eye, by the sun. For the eye is the Adhvaryu of the sacrifice; and what the eye is, that is the sun, and that is the Adhvaryu. That is release, that is complete release."
The commentators
Bṛhadāraṇyakopaniṣadbhāṣyam· bhāṣya
मुक्तिरिति पूर्ववत्; आदित्यात्मभावमापन्नस्य हि नाहोरात्रे संभवतः ॥
In plain words
'Release' — the same reasoning as before. Because once someone has become one with the sun itself, day and night simply stop applying to him.
Close to the Sanskrit
'Release' — as before; for, to one who has attained the state of having the sun as his self, day and night do not occur.