The scientist's error begins when he assumes there is a gulf between the idea and the thing. For it is only his assumption. The experience of the thing and the idea of it are not two sunderable entities. If they were, we should register them as such. But actually we don't; we find that they form a unit of experience, a unit in consciousness.
-- Notebooks Category 21: Mentalism > Chapter 1: The Sensed World > # 115