Nothing on earth is so weak and yielding as water, but for breaking down the firm and strong it has no equal.
LaoziDo not make them (people) weary at their work. If you do not make them weary, they will not be weary of you.
LaoziClay is molded to form a cup, But it is on its non-being that the utility of the cup depends. Doors and windows are cut out to make a room, But it is on its non-being that the utility of the room depends. Therefore turn being into advantage, and turn non-being into utility.
Laozi