Mentalism says we can make sense of our experiences only if we apply to them, and to our understanding of them, the double standpoint: Immediate and Ultimate, or Appearance and Reality, or Relative and Absolute. The ordinary, normal point of view takes the world as the five senses find it--that is, as it appears to be. This is easy for everyone to understand and accept. But the deepest possible examination and analysis by philosophic intelligence, as well as the highest possible insight of mystic experience, presents a totally different result: The One, That which IS, has undergone no change at all.
-- Notebooks Category 19: The Reign of Relativity > Chapter 2: The Double Standpoint > # 3