~ 11 ~

The thirty spokes unite in the one nave; but it is on the empty space for the axle, that the use of the wheel depends. Clay is fashioned into vessels; but it is on their empty hollowness, that their use depends. The door and windows are cut out from the walls to form an apartment; but it is on the empty space within, that its use depends. Therefore, what has a positive existence serves for profitable adaptation, and what has not that for actual usefulness.

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