《资治通鉴·汉纪·汉纪五十八》
现在，应当广开招降的途径，宣扬朝廷的威信，而据险自守这种作法是示弱。 
今当广开降路，宣喻威信。而保险自守，此示弱也。 
Currently, the best approach is to grant amnesty to those who surrender, while defending our fortresses is a sign of weakness. 