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If you can concentrate the mind for two seconds, you can do it for two minutes, and if you can do it for two minutes, you can do it for two hours. Of course, if you want to make this kind of thing horribly difficult, you begin to think about timing yourself. Instead of concentrating, you begin to think about whether you are concentrating, about how long you have concentrated, and about how much longer you are going to keep it up. All this is totally off the point. Concentrate for one second. If, at the end of this time, your mind has wandered off, concentrate for another second, and then
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