"Peace of mind is bright, peace of mind is constant" is a famous saying of the golden mean. The Doctrine of the Mean is one of the traditional Confucian classics, and it is a theoretical work about self-cultivation, governing the country and leveling the world. The book emphasizes the "golden mean", that is, to avoid going to extremes and maintain a state of inner balance and stability. On this basis, we can realize the country's lasting self-cultivation, rule the country and level the world.

The Doctrine of the Mean is a traditional Confucian classic, compiled by Xunzi, and it is a theoretical work on self-cultivation, family harmony and governing the country.