《太平广记·卷一百三十三·　报应》
郡牧尚书刘廙，亲自来问他，然后说： 应该用他平生的一件事，必须是别人不知道的来验证。 
郡牧刘尚书廙，亲呼问之，曰： 宜以平生一事，人无知者以为验。 
The prefectural shepherd and the Shangshu Liu Yi came to ask him in person, and then said: It should be verified with one thing in his life, which must be unknown to others.