《资治通鉴·齐纪·齐纪三》
他的侍臣李元凯回答说： 长江南边有很多优秀的官员，但他们几乎每年更换一次帝王；长江北边没有优秀的官员，但一百年左右才换一次帝王。 
侍臣李元凯对曰： 江南多好臣，岁一易主；江北无好臣，百年一易主。 
His courtier Li Yuankai replied, "There are many excellent officials in the south of the Yangtze River, but they change their emperors almost every year; there are no excellent officials in the north of the Yangtze River, but their emperors only change once every hundred years or so."