KAṬHA UPANISHAD · 2.2.15

न तत्र सूर्यो भाति न चन्द्रतारकं
नेमा विद्युतो भान्ति कुतोऽयमग्निः ।
तमेव भान्तमनुभाति सर्वं
तस्य भासा सर्वमिदं विभाति ॥ १५॥

na tatra sūryo bhāti na candratārakaṃ
nemā vidyuto bhānti kuto’yamagniḥ ।
tameva bhāntamanubhāti sarvaṃ
tasya bhāsā sarvamidaṃ vibhāti ॥ 15॥

There the Sun cannot shine and the moon has no lustre; all the stars are blind; there our lightnings flash not, neither any earthly fire. For all that is bright is but the shadow of His brightness and by His shining all this shineth.

Sri Aurobindo · CWSA 18, p. 123