"The four seasons are born, and all things are born on the earth." The cycle of the sun and the moon begins again and again, forming the natural law of the alternation of day and night and the cycle of four seasons on the earth. All things on the earth follow the laws of this natural cycle of life and death, rise and fall, and growth. Although everything has its own life cycle, the length of the life cycle is different, the shape and movement of life are different, but they basically follow the "spring birth, summer growth, autumn maturity, winter death". The trajectory of the natural four seasons will go through these four major life stages, updated daily, alternate between months and months, reincarnated year after year, and remain unchanged forever.

The ancestors of the Chinese nation recognized this natural law thousands of years ago, and therefore realized the theory of "The Book of Changes", which is a culmination of wisdom. It comprehends the entire process of the origin, change, and development of all things in the universe from the natural laws of the sun, moon, yin and yang, and the cycle of the four seasons, and abstracts it into the theory of yin and yang, the five elements, and the four seasons and eight trigrams, in order to deduce the entire life process of all things in the universe. He also pointed out that the movement of yin and yang and the law of reincarnation of the four seasons are the common laws of all things in the universe. That is to say, "Yin and Yang are the principles of the world; the four seasons are the principles of the world." That is to say, everything in the universe has the characteristics of yin and yang, and it develops and evolves under the interaction and mutual promotion of these two characteristics. The process of evolution and development must go through "initiation, growth, climax, and death." These four major stages are just like the laws of the four natural seasons of "spring birth, summer growth, autumn growth, and winter death". This is the simple and profound natural law of the universe that the alternation of the sun and the moon and the reincarnation of the four seasons reveal to human beings and all things. This is the law of heaven, rules, principles and ways of heaven that are summarized and abstracted from the laws of motion of celestial bodies in the universe. An old saying goes: "Spring is born, summer grows, autumn matures, and winter hides. This is the great path of heaven." Therefore, the Book of Changes comes from the sun and the moon and the four seasons, and it also talks about the laws of the sun and the moon and the four seasons, but later it abstracted and mystified these.

1. Yin and Yang are actually the abstractions of hot and cold. Yin and Yang in "The Book of Changes" are the two core concepts that govern all theories. This word is used to symbolize and explain the essential characteristics of all things in the universe, and is classified accordingly. This is very wise. "One yin and one yang are called the Tao." "Nei Jing" says: "Yin and Yang are the way of heaven and earth, the order of all things, the parents of change, the origin of life and death, and the home of gods." All things in nature are either yin or yang according to time and place, and they are also transforming and complementing each other according to time and place. This is the law of yin and yang changes. The yin and yang are the sun and the moon at the beginning, and the so-called "Yi" is the sun and the moon. The sun and the moon alternate and cycle over and over again, producing changes in cold and heat, which then produce the four seasons of cold and warmth, and then produce all things in nature. Guanzi said: "The way of yang begins with warmth and flourishes with heat; the movement of yin begins with clearness and flourishes with cold; spring, summer, autumn and winter are all different." It is said in the Book of Changes: "Yi has Tai Chi, which gives birth to two rituals...". From the beginning, these two rituals were represented by midnight, noon and day, summer solstice and winter solstice.

Science tells us that the expansion and destruction of the universe is actually the transformation of hot and cold energy. The life process of the universe is an evolution process from extreme heat to extreme cold, and the life of all things in the universe is hot and cold. The process of energy change. Temperature is a measure of hot and cold energy. Therefore, the concept of yin and yang in the "Book of Changes" is consistent with the hot and cold energy of the universe from the beginning. Therefore, the "Zhouyi" touches the depths of the universe and the starting point of the universe from the beginning. Therefore, the fantasy of "The Book of Changes" has become so great, amazing and unfathomable.

2. Bagua is the natural law of the four seasons of spring, summer, autumn and winter. Bagua is one of the most important cycle theories in the Book of Changes. Where did the Bagua theory come from? It evolved from Yin and Yang. "Book of Changes" says: "Yi has Tai Chi, which generates two rituals, two rituals generate four images, and four images generate Bagua." Cold and heat generate four phenomena, the four phenomena are the four seasons, and the four seasons produce the Bagua. Therefore, this sentence clearly states the relationship between the Yin and Yang seasons and the Bagua. It also explains that the Bagua is derived from the four-season cycle of spring, summer, autumn and winter, which means that the four seasons are divided into eight seasons, namely "beginning of spring, vernal equinox, Beginning of summer, summer solstice, beginning of autumn, autumnal equinox, beginning of winter, and winter solstice.” Later, the twenty-four solar terms were divided into three parts of the eight seasons, dividing the turning points of the seasons. Therefore, Bagua is actually the natural law of the four seasons of spring, summer, autumn and winter.

It's just that Fuxi used the eight characters "Qian, Dui, Li, Zhen, Xun, Kan, Yin, and Kun" to represent the four seasons and eight sections in order to analogize all things in nature. In this way, the Bagua theory becomes abstract. When it was transformed, it was born out of the Four Seasons and Eight Sections and turned into a highly abstract and highly generalized speculative theory. It also turned into an inscrutable metaphysical theory, but the Bagua theory is always inseparable from the natural four seasons of spring, summer, autumn and winter. this time period. Anyone who has seen the famous "River Picture" in "The Book of Changes" knows that the natural four seasons of spring, summer, autumn and winter are still essential time cycles for Bagua.

3. The five elements are the forms of all things in the natural four-season cycle. The Five Elements Theory and the Zhouyi were originally two different theoretical theories. Later, during the Warring States Period, the two theories gradually merged into one, forming the "Yin-Yang Five Elements Theory". The Five Elements Theory became an important part of the Zhouyi, and was also used in To explain the origin and development of all things in the universe. "The sky has four seasons and time and space cycles, and the earth has the changing forms of all things." The theory of the Five Elements has three meanings: first, everything in the universe is composed of five substances: "gold, wood, water, fire, and earth"; second, these five natural substances move and transform each other; third, nature The changing forms of all things are basically these five forms. The changes of the five elements are inseparable from the natural four-season cycle or time and space, and the "Book of Changes" talks about the natural four-season cycle or time and space, lacking material content, so the two theories complement each other and naturally merge together, so "Nei Jing" says: "Therefore, Yin and Yang, the Five Elements and the Four Seasons, are the beginning of all things and the foundation of life and death."

The Yin and Yang, Four Seasons, Five Elements and Eight Diagrams in the theory of "Zhouyi" are actually about the time and space cycle of the universe. , an abstract overview of the morphological changes of all things in the universe and the relationship between the two, and use it to predict the future of all things in the universe. "The Book of Changes" clearly states: "In ancient times, Bao Xi's world, looking up, observed the images in the sky, looking down, observing the laws on the earth, observing the patterns of birds and beasts and the suitability of the earth, taking in objects from near and objects from far away. , so he began to make Bagua in order to understand the virtues of gods and imitate the emotions of all things." This passage has made it very clear that it abstracts, generalizes and theorizes the "Book of Changes". Just like the great scientist Newton, he realized and abstracted the great theory of "gravity" from the phenomenon of apple falling from the orchard tree in life. The same is true for the "Book of Changes". It is also understood from the sun, the moon, the four seasons, and the five elements. There is nothing mysterious about it, just as Confucius said, "Easy to simplify, the principles of the world can be understood."

"The Book of Changes" is a theory dreamed up by thinkers. Unfortunately, it did not become the source of the development of ancient Chinese science, but it became the originator of witchcraft such as fortune-telling, fateful reincarnation, and fantasy. It is understandable that the ancients made the "Book of Changes" mystical and magical, because science was not yet developed at that time. It is understandable that ordinary people today regard "The Book of Changes" as unfathomable, because after all, ordinary people today still like to learn current scientific knowledge, but if today's experts and scholars continue to regard "The Book of Changes" as unfathomable, then It's mysterious, so it's just a trick to cheat people into eating and drinking.