"There the sun does not shine; nor the moon and the stars; nor do these lightnings shine; nor even this fire. All this shines after that Light; by Its effulgence all this shines." -Katha Upanishad.
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Whatever he (the Yogic practioner) see with his eyes, let him consider as Atman. Whatever he hears with his ears, let him consider as Atman. Whatever he smells with his nose, let him consider as Atman. Whatever he tastes with his tongue, let him consider as Atman. Whatever the Yogi touches with his skin, let him consi...der as Atman. ~Swami Sivananda on Yogatattva Upanishad.