What Does “Connecting with Heaven” Mean? The Human Being Is Not a Closed System

The first four series moved from one breath, pulse movement, the ten tones, the Twelve Lü, the Sixty Shou, and finally the Eight She, mainly asking how qi inside the body can be observed, localized, and compared. With “Tongtian,” the field of view suddenly opens outward: where does this bodily system obtain the conditions that allow it to keep functioning?

The text answers directly:

Heavenly qi enters and leaves the human being through the agitation and stillness of the sun, moon, stars, and clouds. Earthly qi supports human generation through living conditions, cold and heat, and the transformation of things.

These two sentences state the basic position of “Tongtian” clearly: the human being is not a closed system.

Heaven and Earth are not a background; they continuously enter the body as conditions

The text continues:

Heaven feeds the human being with the Five Qi; Earth feeds the human being with the Five Tastes. The Five Qi enter through the nose and are stored in the palace of blood; the Five Tastes enter through the mouth and are stored in the palace of grain.

Here “feeds” does not refer only to eating. It describes two classes of inputs the body continuously receives: one enters through breathing and the external climate, and the other through food, drink, and the residential environment. After entering the body, they do not remain at the nose and Stomach but continue to participate in the transformation of blood, qi, essence, and form.

“Tongtian” therefore does not merely state abstractly that “human beings correspond with nature.” It establishes an input chain:

external climate / breathing → bodily qi and blood; food / earthly qi → Stomach and Intestines transform substances → transformation of form, qi, and essence.

“Connecting with Heaven” is really about exchange

The text says:

When qi is harmonious, life arises and vessel qi flows through the channels. When taste provides support, blood and qi can flow. The Stomach and Intestines receive and contain, transforming substances and changing them into qi. All separately pour into their seas.

Notice the repeated verbs “flow,” “transform,” and “pour.” This shows that the Mirror Classic is not mainly interested in dividing the body into many static organs. It asks how different sources enter, how they are transformed, and into which system they finally flow.

This is fully consistent with the earlier doctrine of the Eight She. A She is a position of qi interaction; a Hou is an observation window of qi movement. In “Tongtian,” external qi and taste now enter the same network of qi interaction.

How can a modern reader understand this?

Using modern systems language only as an aid, the body can first be viewed as an open dynamic system. It continuously exchanges gases, food, heat, and information with the environment while also being influenced by day-night cycles, cold and heat, living conditions, and emotional states.

But this is only a convenient analogy. The Mirror Classic’s “qi” cannot be directly equated with any single modern physical quantity.

What is methodologically important in the Mirror Classic is that it does not leave “correspondence between Heaven and humanity” as a philosophical slogan. It attempts to reconnect external input with pulse and breath, channels, zang-fu, essence-qi, Hou, and She.

The fifth series therefore proceeds by taking apart this Heaven–Earth–Human grammar: What kinds of external inputs are there? What common rules does the body use to process them?