This is passive Mind or pure Being, the First, the Unconditioned Origin of all, the Inconceivable and Unknowable. It is beyond the capacity of any individual entity to penetrate this mystery of mysteries and still remain an individual. A mediating principle is necessary. This exists in the Overself, in man's higher self, which is nothing less than a germ of that same infinite life. If this were not present in man, not only would mystical experience be impossible for him but all religious intuition would be mythical to him.
-- Notebooks Category 28: The Alone > Chapter 2: Our Relation To the Absolute > # 82