The Way of Tao is this: It strives not, but conquers; It speaks not, but all is made clear; It summons not, but its house is crowded; It contrives not, but the design is perfect.
LaoziClay is fashioned into vessels; it is on their empty hollowness that their use depends. Doors and windows are cut out to make a dwelling, and on the empty space within, its use depends. Thus, while the existence of things may be good, it is the non-existence in them that makes them serviceable.
Laozi