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One important reason why the great spiritual teachers have always enjoined upon their disciples the need of surrendering the ego, of giving up the self, is that when the mind is continually preoccupied with its own personal affairs, it sets up a narrow limitation upon its own possibilities. It cannot reach to the impersonal truth, which is so different and so distant from the topics that it thinks about day after day, year after year. Only by breaking through its self-imposed pettiness can the human mind enter into the perception of the Infinite, of the divine soul that is its innermost being.
-- Notebooks Category 8: The Ego > Chapter 4 : Detaching from The Ego (Part I) > # 2