《管子·宙合》
天，不只有一个时序；地，不只有一种物利；人的活动，不只限一件事情。因此，事业不能不分为多种，名位不能不分为多样。
天不一时，地不一利，人不一事 ，是以着业不得不多，人之名位不得不殊方。
Heaven does not have only one season; the earth does not have only one kind of material benefit; human activities are not limited to one thing. Therefore, careers cannot but be divided into different types, and positions cannot but be divided into different types. 