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.
Thirty spokes meet in the hub,
but the empty space between them
is the essence of the wheel.
Pots are formed from clay,
but the empty space within it
is the essence of the pot.
Walls with windows and doors
form the house,
but the empty space within it
is the essence of the home.