What is bestowed on us at birth
is called human nature.
The fulfillment of human nature
is called the Tao.
The cultivation of the Tao
is the deepest form of learning.

The Tao is the way things are,
which you can't depart from
even for one instant.
If you depart from it,
it wouldn't be the Tao.
Therefore the Master
looks into her own heart
and respects what is unseen and unheard.

Nothing is more manifest than the hidden;
nothing is more obvious than the unseen.
Therefore the Master
pays attention to what is happening
within her innermost self.

Stephen Mitchell (The second book of the Tao) Chapter 1.