? The subtle substances produced by grains diffuse from the upper jiao, fumigate the skin, nourish the whole body, nourish the hair, and nourish everything like fog and dew. This is called "Qi". The source of qi, first, is inherited by congenital parents, which is called vitality and enters the kidney. Second, it comes from the qi of the valley in the later period, and the spleen and stomach transport and fill the five internal organs, that is, the qi of each dirty organ. The combination of two kinds of qi is the motive force of life activities. Therefore, "Lingshu" said: "Those who are really angry, influenced by heaven, are also filled with grain."
? Qi is a kind of substance between tangible and intangible, which is invisible to the naked eye, but it is also the basic substance to maintain human vitality and the energy source of human organs and tissues. The mutual transformation and metabolism of essence, qi, blood and body fluid in our body are realized by qi, and this process of energy transformation is called "gasification". If the human body is full of gas, the gasification function will be strong; If the human body is deficient in qi, its gasification function will be weak. If the gasification function is powerful, it can eliminate evil, dampness, cold, poison, fat, addiction and diseases. Qi is the strength of human body, and blood is the source of this strength. Qi and blood are yin and yang, and pneumatic is invisible, belonging to yang; Blood is tangible and static, belonging to yin.
"Homologous qi and blood" often influence and change each other. Qi deficiency can't produce blood, while blood deficiency can get angry. Therefore, shun is safe; Qi is there, then people are there.