《左传·定公·定公十年》
我们所以事奉君王，是为了国家疆土的安全，岂敢为了家臣而劳驾君王的执事？
所以事君，封疆社稷是以。敢以家隶勤君之执事。
The reason we serve the king is in order to ensure the safety of the nation's borders. How could we dare request the king's service on behalf of a house servant?