? We then introduce the basic content of Yin-Yang theory, Yin-Yang Sympathy. Sympathy between yin and yang refers to the interaction between yin and yang and qi, which induces each other in movement. First of all, Yin and Yang will induce each other, for example, the N and S poles of magnetic poles will attract each other; Male and female animals attract each other. If the relationship between the two is not yin and yang, it is difficult to induce each other, as the saying goes. Secondly, Yin and Yang will have intercourse at the same time. For example, when an acid meets an alkali, it will undergo a neutralization reaction to generate a salt; When male sperm meets female eggs, they will combine into fertilized eggs.

? The meaning of yin-yang sympathy has two aspects. First, the traffic of Yin and Yang is consistent, which is the root of the emergence and change of all things in the universe. "Zhouyi Idle Elephant" says that "heaven and earth have a sense of life." The combination of yin and yang is the foundation of the metaplasia of everything in the world. Yang Qi rose to the sky, while Yin Qi froze on the ground. The weather drops, the earth's atmosphere rises, the yin and yang of heaven and earth interact, and the sympathetic harmony produces everything. The Book of Changes says that "the secret of heaven and earth is the alcohol of all things; Both men and women are fine, and everything is transformed. " "Zhuangzi Tian Zifang" said, "To the Soviet Union, to Yang Hehe, it is beyond the sky, and its brilliance is also. The traffic between the two is harmonious, but things are born. "

? In nature, yin and yang interact to form clouds, fog, thunder and rain, and everything can be transformed. As one of the things in the universe, human beings are also generated by the interaction of yin and yang of heaven and earth. Therefore, "Su Wen Bao Quan Ming Xing Lun" says that "man is born with the spirit of heaven and earth, and is formed by the method of four seasons. Born in the ground, life hangs in the sky, heaven and earth blend together, and life is like a person. " Life is born under the interaction of yin and yang of heaven and earth. Without the sympathetic movement of Yin and Yang, there would be no natural things and no life.

? Second, yin-yang sympathy is the driving force for the development and change of things and phenomena. Yin and Yang have opposite properties. They constantly rub against each other and interact with each other, making everything in the universe endless and endless. In nature, it is precisely because of the decline of the sun's yang that the earth's yin and yang rise, and the constant interaction of yin and yang forms sunshine and rain dew, bathing and moistening everything, and everything can flourish. Therefore, ancient philosophers attached great importance to the compatibility of Yin and Yang. "Zhouyi" pointed out that "heaven and earth meet, Thailand; Heaven and earth don't meet, no "heaven and earth meet, divination is Kun up and down; Heaven and earth never meet, and divination is necessary. Because the yang qi in the sky is floating, the yin qi in the ground is sinking, and the yin is above the yang, so that the yin and yang of heaven and earth can be in harmony and wrong, and the vibrant state of nature can be maintained. If the yang is above, the yin is below, and the yin and yang of heaven and earth are not harmonious and fall apart, the vitality of nature will be curbed.

? To sum up, the interaction between Yin and Yang in motion is the root of the creation and change of everything in the universe, and it is also the driving force for the development and change of things and phenomena. Therefore, "Xunzi Book of Rites" says that "heaven and earth combine to create everything, and yin and yang change."