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The fact that one may not have had any apparent mystical experience, even though he has tried practising concentration, need not dismay him. Concentration alone is not enough. It is no less important to practise prayer and aspiration, unremitting effort at improving character and eliminating weaknesses, strengthening the will and purifying the emotions. If he applies faithful and persistent effort in these directions, he will not only cultivate a properly balanced and well-developed personality, but he will eventually call forth the Grace and Guidance of the Overself.
-- Notebooks Category 2: Overview of Practices Involved > Chapter 5 : Balance the Psyche > # 64