We join spokes together in a wheel, but it is the center hole that makes the wagon move. We shape clay into a pot, but it is the emptiness inside that holds whatever we want. We hammer wood for a house, but it is the inner space that makes it livable. We work with being, but non-being is what we use.
Ever desireless, one can see the mystery. Ever desiring, one can see the manifestations. These two spring from the same source but differ in name; this appears as darkness. Darkness within darkness. The gate to all mystery.
Without opening your door, you can open your heart to the world. Without looking out your window, you can see the essence of the Tao. The more you know, the less you understand. The Master arrives without leaving, sees the light without looking, achieves without doing a thing.