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...what hinders the experience is the absence of the practice of concentration, and also the absence of one- pointedness, singleness of purpose, of will. One "wants" it for a minute, two minutes, ten minutes, a quarter of an hour, an hour, and afterwards, one wants many other things.... One "thinks" about it for a few seconds, and after that thinks of a thousand other things. <ref>http://incarnateword.in/cwm/05/12-august-1953#p26 </ref>