《战国策·齐二·或谓齐王》
如果秦国进攻周国、韩国的西面，赵国、魏国不进攻，周国、韩国也会被秦国割取土地，韩国退却，周国更会遭到危害。
秦伐周、韩之西，赵、魏不伐，周、韩为割，韩却周害也。
If the state of Qin attacks the states of Zhou and Han from the west, and the states of Zhao and Wei do not attack, the states of Zhou and Han will also lose their land to the state of Qin. If the state of Han retreats, the state of Zhou will be in even greater danger.