《贞观政要·卷一·论政体》
出门旅游或做生意的人，也不会碰上小偷强盗，国家的牢房常常是空的，野外放牧的牛马不用看管，夜晚家家户户的门也不用上锁。
商旅野次，无复盗贼，囹圄常空，马牛布野，外户不闭。
Those who went out travelling or doing business would not encounter thieves or robbers and the country's prisons were usually empty. Cattle and horses out grazing in the countryside did not need to be guarded and most households did not need to lock their doors at night.