《资治通鉴·汉纪·汉纪十》
 这两个问题，是关系国家安危的关键，贤明的君主对此是应该注意并且认真观察的。
此二体者，安危之明要，贤主之一留意而深察也。
These two issues are key to the security of the country, and the wise monarch should pay attention to them and observe them carefully.