Better stop short than fill to the brim. Oversharpen the blade, and the edge will soon blunt. Amass a store of gold and jade, and no one can protect it.
Why is the sea king of a hundred streams? Because it lies below them... If the sage would guide the people, he must serve with humility. If he would lead them, he must follow behind. In this way when the sage rules, the people will not feel oppressed.
Clay 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.