《汉书·志·五行志下之下》
《诗经》上说： 有的人，悠闲安居纵情志；有的人，精疲力竭勤王事，他们最后结果就是这样不同。 晋侯说： 六物是什么? 
《诗》曰： 或宴宴居息，或尽悴事国。 其异终也如是。 公曰： 何谓六物？ 
The book of Songs says: Some people have a leisurely life and indulge their emotions, while others have to give their best in the service of the king, they eventually end up in different situations. The Duke of Jin said: What are the six things? 