Dao De Jing, chapter 11

When thirty spokes unite in a hub,
The emptiness [holding the axle] makes the cart [i.e., wheel] useful.
When wet^[11-1] clay becomes a pot,
Its emptiness makes the pot useful.
When doors and windows are cut out of a house[’s walls],
Their emptiness makes the house useful.
Thus existence makes things beneficial,
Emptiness makes them useful.

^[11-1] Other texts have “fired”

三十辐共一毂，
当其无，有车之用。
埏埴以为器，
当其无，有器之用。
凿户牖以为室，
当其无，有室之用。
故有之以为利，
无之以为用。

---L.