Sanskrit: न तत्र सूर्यो भाति न चन्द्रतारकंनेमा विद्युतो भान्ति कुतोऽयमग्निः ।  तमेव भान्तमनुभाति सर्वंतस्य भासा सर्वमिदं विभाति ति काठकोपनिषदि द्वितीयाध्याये द्वितीया वल्ली  
English: 15  The sun does not shine there, nor the moon and the stars, nor these lightnings-not to speak of this fire. He shining, everything shines after Him. By His light all this is lighted.