When all the world recognizes beauty as beauty, this in itself is ugliness.
When all the world recognizes good as good, this in itself is evil.
Indeed, the hidden and the manifest give birth to each other.
Difficult and easy complement each other.
Long and short exhibit each other.
High and low set measure to each other.
Voice and sound harmonize each other.
Back and front follow each other.

Therefore, the Sage manages his affairs without ado,
And spreads his teaching without talking.
He denies nothing to the teeming things.
He rears them, but lays no claim to them.
He does his work, but sets no store by it.
He accomplishes his task, but does not dwell upon it.
And yet it is just because he does not dwell on it
That nobody can ever take it away from him.

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” of 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 both are called mysteries.

The Mystery of mysteries is the Door of all essence.