《宋史·列传·卷一百六十四》
自古国家安定，周围的少数民族臣服，统治的时间久了，就渐渐产生了侈奢的心理，如汉武帝使匈奴单于震动和畏惧后，他就去游览各地，唐明皇时北方安定，他就去骊山温泉巡幸。
自昔国家乂安，四夷宾服，享国日久，侈心渐生，若汉武帝之单于震慑，而有千门万户之观，唐明皇之北边无事，而有骊山温泉之幸。
Since ancient times, when a country was stable and the surrounding ethnic minorities were submissive, after a long period of rule, there would gradually be a psychology of extravagance and luxury. For example, after Emperor Wu of Han made the Xiongnu Chanyu tremble and fear, he went on tours to various places, and when the north was stable during Emperor Ming of Tang's reign, he went on a tour of the Lishan Hot Springs.