What Heaven ordains is called “nature”;
following one’s nature is called “the Way”;
cultivating the Way is called “teaching”.
The Way cannot be parted with for even a moment;
what can be abandoned is not the true Way.
Therefore, the gentleman is vigilant and cautious where no one sees him,
and reverent and apprehensive where no one hears him.
Nothing is more visible than what is hidden;
nothing is more manifest than what is subtle.
Thus, the gentleman is especially careful when alone – this is called “being watchful over oneself in solitude”.
When joy, anger, sorrow, and pleasure have not yet arisen, this state is called “Equilibrium”;
when they arise and all accord with due measure, this is called “Harmony”.
Equilibrium is the great root of all under heaven;
Harmony is the universal path by which all under heaven proceed.
When Equilibrium and Harmony are fully realized,
Heaven and Earth take their rightful places,
and all things flourish.
天命之謂性，率性之謂道，修道之謂教。
道也者，不可須臾離也，可離非道也。
是故君子戒慎乎其所不睹，恐懼乎其所不聞。
莫見乎隱，莫顯乎微。
故君子慎其獨也。
喜怒哀樂之未發，謂之中；
發而皆中節，謂之和；
中也者，天下之大本也；
和也者，天下之達道也。
致中和，天地位焉，萬物育焉。
Note
The opening chapter of the Doctrine of the Mean constructs a philosophical system that unifies Heaven and humanity, linking inner sagehood with outer kingship. The statement “What Heaven ordains is called nature” roots human moral nature in the cosmic order – Heaven’s Mandate – thereby endowing human nature with sacredness and universality. Humans are not passive recipients of fate; rather, by “following their nature”, “cultivating the Way” (called teaching, instruction or education) they consciously embody the Heavenly Way and achieve unity with Heaven.
“The Way cannot be parted with for even a moment” underscores the continuous and internal nature of moral practice. The true Way is not an external rule but the unfolding of life itself. Hence, the gentleman must practice ‘shen du’ (“watchfulness in solitude”) – maintaining moral vigilance even when no one is watching. As Zhu Xi explains in his Commentary on the Doctrine of the Mean: “‘Solitude’ refers to that realm known only to oneself, though unknown to others.” ‘Shen du’ is thus the core discipline of Confucian self-cultivation, reflecting profound moral autonomy.
“Equilibrium” and “Harmony” are central concepts. Equilibrium (‘Zhong’) denotes the inner balance before emotions arise – the innate, unbiased state of human nature. Harmony (‘He’) refers to the dynamic harmony achieved when emotions express themselves in due measure. They are two aspects of one reality: Equilibrium as essence, Harmony as function. Only by preserving equilibrium can one realize harmony.
Ultimately, “realizing Equilibrium and Harmony” is not merely the pinnacle of personal cultivation but the foundation of cosmic order. When the sage or ruler embodies this principle, Heaven and Earth assume their proper positions, and all things thrive. This reflects the Confucian vision of “immanent transcendence”: moral practice participates in and sustains the generative processes of the cosmos. Echoing the Book of Changes (I Ching, or Yi Jing) – “Observe human culture to transform and perfect the world” – the Doctrine of the Mean elevates ethics to a metaphysical plane, laying the groundwork for later Neo-Confucian doctrines such as “human nature is principle” and “the mind unifies nature and emotion.”
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