《北史·列传·卷四十七》
常常优厚地抚慰境外来的人，让他们当间谍。所以，敌方的动静，他都能提前掌握。
每厚抚境外之人，使为间谍，敌中动静，必先知之。
Often generously appease people from outside the country and let them be spies. Therefore, he could grasp the enemy's movements in advance.