The ancient sages and emperors formulated rituals and laws in order to educate and educate the people of the world. To correct the three cardinal principles (relationships between monarch and ministers, father and son, and husband and wife), we must find our own place. The nine categories (i.e., the Five Elements, the Five Things, the Eight Governments, the Five Disciplines, the Emperor, the Three Virtues, Jiji, Shuzheng, and Fuji) are in order. The people will be able to live in peace and build a harmonious society. This is not only true for people, but also for all things. After the education of the whole society was done, the saints created music to promote the eight winds. Therefore, the music produced by the ancient holy kings was very elegant and harmonious, not sad at all, not excessive at all (obscene means excessive). As long as this sound enters your ears, you are influenced. Only this kind of very elegant and harmonious music can make people feel calm.