The essential formal concentration practice instructions are: pick an object (the list on page 13 is a great place to begin), find a place to practice where you are as free from distractions as possible, pick a sustainable posture in which the spine is relatively straight (it doesn't really matter so much, but for this training it helps if it is somewhat comfortable), focus your attention on the object as completely and consistently as possible for the duration of that practice period, allowing as few lapses in concentration as possible, and learn to stabilize all of your attention on that
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