《汉书·纪·宣帝纪》
官吏首务是依法办事，而有的为了让来往客使称心如意，就任意派遣听差役夫，提高客使食饮标准，僭越职权和无视法规，以博取客使对他的好评，这好比踏着薄冰而等待烈日，难道还不危险吗？
吏务平法。或擅兴徭役，饰厨、传，称过使客，越职逾法，以取名誉，譬犹践薄冰以待白日，岂不殆哉！
Officials’ first duty is to follow the law, but some, in order to make visiting ambassadors pleased and happy, arbitrarily dispatch attendants and porters, increase the food and drink standards for the ambassadors, exceed their authority and ignore laws so as to win appreciation from them. This is like standing on thin ice and waiting for the sun, is it not perilous?