The nature of world experience, such as moving, talking, or reading, must eventually be understood as mental or mind-made; but your experience of its activity or forms does not change, only your understanding of it: that is, that it is basically mental activity and these are mental forms. For whatever they do and however they behave or seem to behave, whatever you can know of them can be grasped only with the mind. They obviously have their own mental existence and activity even when you are not present to observe it. We must keep our common sense even when learning to reason philosophically.
-- Notebooks Category 21: Mentalism > Chapter 3: The Individual and World Mind > # 6