Zheng said: In the past, Lu Zhou Gong said: I have heard from Zheng that one who knows what is good but does not act upon it is called a madman, and one who knows what is evil but does not correct it is called confused. A madman and a confused person are the warnings of sage kings.

This compact teaching carries profound weight in the Taoist tradition. The failure to act on moral knowledge is not merely weakness — it is a form of spiritual disorder. This connects directly to Laozi's vision of the sage who acts in accordance with his understanding, never separating knowledge from conduct.

The figure of Zhou Gong — the Duke of Zhou — was revered across both Taoist and Confucian traditions as a model administrator. His appearance in Yu Zi reflects the shared moral ground between these schools, a relationship explored in Jie Ni, the hermit who refused Confucius. The sage king who heeds these warnings embodies wu wei (non-action) — not passivity, but the effortless alignment of knowledge, virtue, and deed.

Primary sources include the Shoushanige Congshu edition, the Zhengtong Daozang (Taoist Canon) edition, and the Mohaijinju edition. Zhou Gong's moral philosophy bridges Taoist and Confucian thought, reflecting the origin and development of Taoism as a tradition in dialogue with classical Chinese governance.