The Buddha said: "All that is seen in the world is devoid of effort and action because all things in the world are like a dream, or like an image miraculously projected . . . Those who see things otherwise walk in discrimination and, as they depend upon discrimination, they cling to dualism. The world as seen by discrimination is like seeing one's own image reflected in a mirror, or one's shadow, or the moon reflected in water, or an echo heard in a valley."
-The Lankavatara Sutra