《战国策·韩一·秦攻陉山》
观在大王继续攻打韩邑，这是断绝了重要的邦交并限制了府库的财路啊，臣私下认为大王的做法不可取。 
今王攻韩，是绝上交而固私府也，窃为王弗取也。 
In my humble opinion, it is unwise for Your Majesty to continue attacking Han's cities, as this will cut off important diplomatic relations and limit the source of income for the treasury.