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Because I gave out an exercise (in The Quest of the Overself) in gentle, shallow breathing to be done for not more than five or six minutes when preparing for meditation in order to help induce the proper condition of calmness, some wrongly understood this to be a recommendation to be practised constantly throughout the day, and for a special purpose. To do it as a settled way of breathing was never advised and ought never to have been misread into the published instructions. On the contrary, for habitual day-long use I advise always and prescribe with conviction the method of deep diaphragmatic breathing as one to be adopted as customary.
-- Notebooks Category 5: The Body > Chapter 6 : Breathing Exercises > # 45