山木自寇也，
膏火自煎也。
桂可食，故伐之；
漆可用，故割之。
人皆知有用之用，
而莫知無用之用也。
Mountain trees self-destruct,
Lamp tallow self-immolates.
Cinnamon is edible, so it is cleaved;
Varnish is useful, so it is cut.
All men know the advantage of being useful,
but none know the advantage of being useless.
— 莊子 [Zhuang Zi], Zhuang Zi, “Transactions in the World of Men” (“人間世”).