The word Overmind should never have been introduced, but now that it is here it must be explained. There is only one Reality. The nearest notion we can form of it is that it is something mental. If we think of it as being the sum total of all individual minds, then it is Overmind; if we can rise higher and know that it cannot be totalized, it is Overself. The first explanation was originally introduced to explain why abnormal phenomena can happen but not as a final explanation of what Mind and Reality are. People have confused the two aims. Actually there is only One thing, whatever you call it, but it can be studied from different standpoints and thus we get different results. That thing is Mind--unindividuated, infinite.
-- Notebooks Category 12: Reflections > Chapter 5: The Literary Work > # 235