The Vedantin tells you, "Your experience of the world is illusory; you take it to be existent; you see a snake when there is only a rope." But the philosopher comments: "It is misleading only if while you are in the body you take it to be utterly and ultimately real. The world is actually there, but what is it that makes it there for you? Consciousness! That is the reality. But what you call consciousness is only a fragment, a very small confined thing, compared with its source."
-- Notebooks Category 21: Mentalism > Chapter 5: The Key To the Spiritual World > # 176