Once you sit, do not change the position again until the end of the time you determined at the beginning. Suppose you change your original position because it is uncomfortable, and assume another position. What happens after a while is that the new position becomes uncomfortable. Then you want another and after a while it, too, becomes uncomfortable. So you may go on shifting, moving, changing one position to another the whole time you are on your meditation cushion, and you may not gain a deep and meaningful level of concentration. Therefore, you must make every effort not to change your
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