中Zhōng庸Yōng · The Doctrine of the Mean

Like the Da Xue, the Zhong Yong (Doctrine of the Mean) was originally a chapter of the Li Ji that Zhu Xi promoted into the Four Books. Traditionally attributed to Confucius's grandson Zisi, it asks what it means to stay centered (中) and in tune (和) — both inside oneself and in one's conduct toward others. Where the Da Xue lays out the Confucian program as a ladder of steps, the Zhong Yong meditates on the inner disposition that makes those steps possible. It is short, dense, and quietly metaphysical — at points the argument opens out into a cosmology where the cultivated person aligns with heaven and earth. The 'mean' here is not mediocrity or splitting the difference; it is the harder ideal of hitting the right note in each situation. English seeding is James Legge (public domain); modern alternatives (Ames & Hall, Tu Weiming) are referenced, not stored.