In the highest antiquity, the people did not know that there were rulers. In the next age they loved them and praised them. In the next they feared them; in the next they despised them.
LaoziClay is fashioned into vessels; it is on their empty hollowness that their use depends. Doors and windows are cut out to make a dwelling, and on the empty space within, its use depends. Thus, while the existence of things may be good, it is the non-existence in them that makes them serviceable.
Laozi