No motto. Why?
The Tao that can be spoken of is not the enduring and unchanging Tao. The name that can be named is not the enduring and unchanging name.
Having no name, it is the Originator of heaven and earth; having a name, it is the Mother of all things.
We should rid ourselves of desires if we wish to observe its subtlety; we should allow our desires if we wish to see something of its manifestations.
Under these two aspects, it is really the same; but as development takes place, it receives the different names. Together we call them the mystery; where the mystery is the deepest is the gate of all that is