Chapter 21 introduces the concept of Virtue (De), whose essential characteristics are defined by the Dao itself.
Chapter 17 of the Dao De Jing (Tao Te Ching) establishes a hierarchy of governance where political excellence is measured by its operational invisibility.
Chapter 16 of the Dao De Jing synthesizes two pillars of spiritual practice: the cultivation of stability and the cultivation of wisdom.
Dao belongs to the metaphysical realm. We cannot perceive it through sight, hearing or touch.