Balanced harmony is an ideal state of human mind. When people’s emotions such as joy, anger, sorrow, and happiness are expressed in an unbiased way in keeping with the rites, a state of mind featuring balanced harmony is achieved. If a ruler can reach such a state of mind and exercise governance accordingly, everything in heaven and earth will be in its proper place, be orderly and in harmony with each other. This will deliver common prosperity and development for all.
When joy, anger, sorrow, and happiness are not yet expressed as a response to other things, they are in a state of balance. When they are expressed in words and deeds in accordance with the rites, harmony is achieved. Balance is the foundation under heaven, while harmony is the universal rule under heaven. If a ruler can achieve balanced harmony, both heaven and earth will be in their proper places, and all things will prosper and thrive. (The Book of Rites)
When one rules the world with balanced harmony, virtuous governance will flourish. When one achieves balanced harmony in self-cultivation, he will enjoy longevity. (Dong Zhongshu: Luxuriant Gems of The Spring and Autumn Annals)