A vessel is formed from a lump of clay with care, however, it is the empty space within the vessel that makes it useful.
LaoziThe leader is best, When people are hardly aware of his existence, Not so good when people praise his government, Less good when people stand in fear, Worst, when people are contemptuous. Fail to honor people, and they will fail to honor you. But of a good leader, who speaks little, When his work is done, his aim fulfilled, The people say, 'We did it ourselves.'
Laozi