《资治通鉴·汉纪·汉纪三十七》
夏季，四月甲子，明帝下诏： 祥瑞降临，是德行的感应。如今政治多有邪僻，怎么能够引来祥瑞！
夏，四月，甲子，诏曰： 祥瑞之降，以应有德；方今政化多僻，何以致兹！
In summer, on Jiazi day of the fourth lunar month, Mingdi issued an edict: "When an auspicious sign appears, it is a manifestation of good virtue. Recently, the governance has been often improper, so how could there be an auspicious sign?"