One may be fortunate enough to have a most uncommon mystical experience. His desire to experience it again may be fulfilled if he attempts the exercise in the fourteenth chapter of The Wisdom of the Overself in which this experience is given as one of the results. It is inevitable that such a high, advanced experience usually occurs at rare intervals. Had he been able to sustain and prolong it for as much as five hours, he would permanently and unbrokenly have entered into the consciousness of his divine soul.
-- Notebooks Category 23: Advanced Contemplation > Chapter 8: The Void As Contemplative Experience > # 185