Chapter 11 of Laotse's TaoTeChing

The thirty spokes unite in the one nave; but it is on the empty space of 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 the house, that its use depends.
Therefore, what the use value we get from existence is created by nonexistence and existence together.

 

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