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Without learning, studying, or practising yoga, Heisenberg, famed nuclear physicist, formulator of the Law of Indeterminacy, unwittingly entered what is a high goal to yogis, Nirvikalpa Samadhi. This happened at times at the end of the deepest abstract thinking about his subject. Thoughts themselves ceased to be active. He found himself in the Stillness of the Void. He knew then, and knows today, his spiritual being.
-- Notebooks Category 22: Inspiration and the Overself > Chapter 5 : Preparing for Glimpses > # 17
-- Perspectives > Chapter 22: Inspiration and the Overself > # 58