Mundaka Upanishad- Verse 10 - Mundaka-2-2-10-na tatra

Mundaka Upanishad – Mundaka 2 – Chapter 2 – Verse 10 « »

न तत्र सूर्यो भाति न चन्द्रतारकं
नेमा विद्युतो भान्ति कुतोऽयमग्निः ।
तमेव भान्तमनुभाति सर्वं
तस्य भासा सर्वमिदं विभाति ॥ १०॥

na tatra sūryo bhāti na candratārakaṃ
nemā vidyuto bhānti kuto’yamagniḥ .
tameva bhāntamanubhāti sarvaṃ
tasya bhāsā sarvamidaṃ vibhāti .. 10..

10 The sun does not shine there, nor the moon and the stars, nor these lightnings, not to speak of this fire. When He shines, everything shines after Him; by His light everything is lighted.

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Sri Shankara’s Commentary (Bhashya) translated by S. Sitarama Sastri

How that is the light of all lights is explained. The sun, though enlightening all. does not shine in, i.e., does not illumine the Brahman which is his Atman; for, the sun illumines the whole universe other than the Atman with the light of the Brahman, but has not in himself the capacity to illuminate. Similarly neither the moon and the stars nor the lightning shines. How could this file which is in the range of our vision? Why dilate? This universe which shines, shines with the light of Him, the Lord of all, who shines being himself luminosity. Just as water and the rest by their contact with fire, heat with the heat of the fire, but not by their own inherent power, so all this universe, the sun and the rest shine with the light of the Brahman. As it is the Brahman alone that thus shines and shines with varying light in its diverse manifestations, itself luminosity, is inferred; for, that which is not itself light cannot illumine others as we see that pots, etc., do not illumine others and that the sun and the rest having light, illumine others.

Links
Various resources on the Mundakopanishad
Upanishad Series – Mundakopanishad Commentary by Swami Chinmayananda

Mundaka Upanishad – Verse 10 – Mundaka-2-2-10-na tatra – In Sanskrit with English Transliteration, Meaning and Commentary by Adi Shankaracharya (Sankara Bhashya) – Mundaka-2-2-10