I have gone looking for myself ...see you later!
Tao can be talked about, but not the Eternal Tao.
Names can be named, but not the Eternal Name.
As the origin of heaven-and-earth. it is nameless:
As "the Mother" og all things,it is nameable.
So, as ever hidden, we should look at its inner essence:
As always manifest, we should look at its outer aspects.
These two flow from the same source, though differently named;
And bot are called mysteries.
The Mystery of mysteries is the Door of all essence.