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.
A tree that can fill the span of a man's arms grows from a downy tip; A terrace nine stories high rises from level earth; A journey of a thousand miles starts from beneath one's feet.
If the majority doesn't laugh at you, beware that you must be saying something wrong. When the majority thinks you are a fool, only then is there some possibility of you being a wise man.