The Tao can be said, and the extraordinary Tao; A name can be a name, not a name.

Nameless, the beginning of heaven and earth, famous, the mother of all things.

Therefore, we often have no desire to see its subtlety, and we often have desire to see its limits.

These two are of the same origin and have different names. They are both mysterious and mysterious. They are the doors of many mysteries BB