《汉书·传·董仲舒传》
汉武帝策问道：听说 善言天的，一定能找到人事来印证，善说古的，一定能在现实中得到证明 。
制曰：盖闻 善言天者必有征于人，善言古者必有验于今 。
Emperor Wu asked: I heard that good speech could always find people, and good speech of the past could always be proven by things.