A passing sign of progress in arousing latent forces and a physical indication that he is on the eve of noteworthy mystical experience may be a sudden unexpected vibratory movement in the region of the abdomen, in the solar plexus. It usually comes when he has been relaxed for a short time from the daily cares, or after retiring to bed for the night. The diaphragmatic muscle will appear to tremble violently and something will seem to surge to and fro like a snake behind the solar plexus. This bodily agitation will soon subside and be followed by a pleasant calm and out of this calm there will presently arise a sense of unusual power, of heightened control over the animal nature and human self. With this there may also come a clear intuition about some truth needed at the time and a revelatory expansion of consciousness into supersensual reality.
-- Notebooks Category 22: Inspiration and the Overself > Chapter 6: Experiencing a Glimpse > # 11
-- Perspectives > Chapter 22: Inspiration and the Overself > # 80