"Ping, the original meaning of coinage: the horn is steady and long, without ups and downs, indicating that the police situation is stable." -Pictographic dictionary
"Peace" is a variety of factors in the environment and our own life. Balance is within the limits that people can bear, so that people can live safely (see Seeking Justice from Confucianism).
"Ping" is also an internal balance and tranquility, without strong impulse or action, and without the inherent attribute that leads to bad luck.
"Secret, bronze inscription is composed of door+necessity, and seal script is composed of indication+necessity" —— See Pictograph Dictionary
"Xu, the original meaning of word-making: nouns, flexible handles of spears, spears and other instruments, made of multi-layered bamboo pieces." -Pictographic dictionary
The handle is the part where people can grasp weapons, and it must symbolize the key to grasping things, so that it can definitely play its due role. So there must be a meaning of "certain and guaranteed" that directly points to the expected result.
Therefore, the meaning of "secret" in bronze inscriptions is: the key of things hidden in the door can be grasped; Seal script means: the key to what can be grasped according to God's instructions. This secret has another meaning: being locked in the door and obeying God's instructions.
Therefore, "secret" means to act fully on the premise of conforming to natural laws and trends, and to act within the boundaries defined on the basis of natural laws and trends in order to achieve inevitable success.
In China's classical philosophy, Yin represents stillness and Yang represents movement; Yin represents matter and Yang represents energy.
Einstein's equation of mass and energy tells people that matter and energy can be transformed into each other. Modern physics tells us that there is no matter that does not move, and there is no movement without mass.
There are a lot of discussions about the mutual transformation of yin and yang in Huangdi Neijing. For example, the last sentence, "yang is not secret, yin is absolute", says that if yang is too strong and cannot be done properly within a reasonable limit, it will cause yin to turn into yang, thus causing yin to be cut off.
The harmony and balance of yin and yang is the premise of the existence of the paradigm of everything. When the dissipation of Yang disappears, matter must change from Yin to Yang, so as to achieve a new balance between Yin and Yang. The low degree is the consumption of matter, and the high degree will cause the variation of matter. Therefore, there is a saying: "yin and yang are separated, and the essence is absolutely."
"Yin and Pingyang are the secret, and God is the rule" means that only when Yin and Pingyang are the secret, the gods can cultivate each other and act reasonably in appropriate channels (movement changes).
It is worth noting that this channel has a high position in Chinese medicine. Whether the channels and collaterals are unobstructed or not, and the yin and yang characteristics of the channels and collaterals indicate whether people are healthy or not.
Traditional Chinese medicine believes that all the five internal organs are storing essence (essence is a substance that causes changes and is a nutrient in all parts of the body; God is two souls that interact and become one; Qi is the place where tiny substances (essence) move and change, and the five internal organs correspond to all parts of the body respectively. There are channels (such as meridians and veins) between the five internal organs and the corresponding parts. Whether the meridians are unobstructed or not is directly related to whether the essence can be transported to all parts of the body, and the yin and yang properties of material energy in the meridians are directly related to whether all parts of the body can be properly nourished. If all parts of the human body are not properly nourished, diseases and dysfunction will occur, thus affecting the internal organs along the meridians. The meridians of various systems in the human body are interrelated and influenced by each other according to the relationship between birth and grams of the five elements, which is reflected in the pathological characteristics of heredity.
Therefore, the situation of the channel can characterize whether all parts of a person's body are normal or not, and whether people have made reasonable reactions in the past. For example, the pulse condition can reflect various diseases of the human body. Smart Chinese medicine practitioners can know what diseases people have, their life and behavior habits, and give people suggestions on preventing and treating diseases in life and behavior.
The Secret of Yin Pingyang defines the scope and boundary of existence and its action, and defines the characteristics and ways of existence and its action, which is related to whether existence and its action conform to the laws and trends of nature and whether existence can get predictable results according to its wishes.
Therefore, the secret of Yin Pingyang is a good domain.