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.
LaoziThose who of old were good practicers of Tao did not use it to make people bright, but rather used it to make them simple.
LaoziThe past has no power to stop you from being present now. Only your grievance about the past can do that. What is grievance? The baggage of old thought and emotion.
Laozi