From the Tao Te Ching of Lao Tzu
Passage No. 11
as translated by Brian Browne Walker
Thirty spokes meet at a hollowed-out hub;
the wheel won’t work without its hole.
A vessel is molded from solid clay;
its inner emptiness makes it useful.
To make a room, you have to cut doors and windows;
without openings, a place isn’t livable.
To make use of what is here,
you must make use of what is not.