Svetasvatara-Upanishad :

"When the light of the Atman or Self has risen, there is no day, no night, neither existence nor non-existence. For the sun does not shine there, nor the moon and the stars, nor these lightnings and much less this fire. When He shines, everything shines after Him; by His light all this is lighted. He makes all. He knows all, the self-caused, the knower, the Time of time!"