《贞观政要·卷一·论政体》
凡大事都是从小事开始，小事不追究，大事就会坏到不可收拾的地步，国家危亡，都是由此而起。
凡大事皆起于小事，小事不论，大事又将不可救，社稷倾危，莫不由此。
All major events start from small ones. If small events are not investigated, major events will become unmanageable, and the country will be in danger.