《战国策·秦二·宜阳未得》
左成对甘茂说： 您在内受樗里疾和公孙衍的攻击，在外与韩国桶国公仲佣结为怨敌，观在您用兵没有取得成功，您必然陷入窘境了。
左成谓甘茂曰： 公内攻于樗里疾、公孙衍，而外与韩侈为怨，今公用兵无功，公必穷矣。
Zuo Cheng said to Gan Mao: "You are attacked by Chu Li Ji and Gongsun Yan at home, and you have become enemies with Gong Zhong Yong of the State of Han abroad. Seeing that your military campaign has not been successful, you will inevitably be in a difficult situation."