All things carry yin and embrace yang. They reach harmony by blending with the vital breath.

A tree trunk the size of a man grows from a blade as thin as a hair. A tower nine stories high is built from a small heap of earth.

Can you open and close the gate of Heaven and act like a woman?

Wary, as if surrounded by strangers.

Can you comprehend everything in the four directions and still do nothing?

When taxes are too high, people go hungry.

Clay 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.