《资治通鉴·周纪·周纪一》
由低至高排列有序，于是万物贵贱的地位便大明于世了。 这是说君主和臣子之间的上下关系就像天和地一样不能互易。
言君臣之位，犹天地之不可易也。
When there is order from the low to the high, then the hierarchy of all things becomes fully apparent. This means that the relationship between ruler and subject must always be like that of heaven and earth, which cannot be reversed.