《礼记·乐记》
上下协调就会互相亲近，贵贱区别就会互相尊重。过分强调乐会使人际关系随便，过分强调礼会使人际关系疏远。
同则相亲，异则相敬，乐胜则流，礼胜则离。
When superiors and subordinates are harmonised they become close, when the noble and the humble are differentiated they respect each other. Overemphasising music makes interpersonal relations casual, and overemphasising rites makes interpersonal relations distant.