The mind passes through a stage when, seeking after truth, it finds out that the world is other than it seems to be, and that its material substance is not matter at all but energy: its form is illusory. But this is not the end. For the seeker does not stop there; if he proceeds farther, he may find that illusion is itself an illusion. It is next found to be derived from reality and to be a form assumed by reality. This is the sage's enlightenment, this is his experience.
-- Notebooks Category 25: World-Mind in Individual Mind > Chapter 2: Enlightenment Which Stays > # 229