The Tao is not Tao

The Tao that can be trodden is not the enduring and
unchanging Tao. The name that can be named is not the enduring and
unchanging name.

(Conceived of as) having no name, it is the Originator of heaven
and earth; (conceived of as) having a name, it is the Mother of all
things.

Always without desire we must be found,
If its deep mystery we would sound;
But if desire always within us be,
Its outer fringe is all that we shall see.

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 subtle and wonderful.