In ancient times and the Middle Ages, people said that the four kinds of people who lived long were real people, wise men, saints and sages. This sentence is found in Huangdi's Neijing, which is the four realms of Taoism. "Truth, wisdom, holiness and virtue" in Huangdi Neijing is the health-preserving culture of traditional Chinese medicine.

In these four Taoist realms, the real person is the highest, probably the person who has realized the unity of heaven and man and mastered the way of nature, and has the highest wisdom of mankind. Followed by sage, sage, sage. This sentence means that human beings are divided into four categories: real people, wise men, saints and sages. In ancient China, there were emperors, also called saints. Real people are the highest realm.

Extended data:

Man is the unity of opposites of Yin and Yang;

Man is the unity of opposites of Yin and Yang, which has been decided at the beginning of life. The essence of parents' life, namely yin and yang, forms a living body. After the life form, Yin and Yang exist in it, which is the condition for each other's existence. Contact with each other, cultivate each other, transform each other and struggle with each other.

Based on the organizational structure of the human body, Huangdi Neijing regards the human body as the unity of opposites of Yin and Yang at all levels, and further divides Yin and Yang into every viscera and every viscera, thus forming the unity of opposites of Yin and Yang at all levels, regardless of the whole and parts, organizational structure and physiological functions.

Baidu encyclopedia-Huangdi Neijing