《北史·列传·卷七》
当元勰写成之后，特别像是皇帝的文章，有见到的人，都说是皇帝御笔所写。
帝曰： 汝亦为才达，但可为之。 及就，尤类帝文，有人见者，咸谓御笔。
After Yuan Xie finished writing, it was especially like an article of the emperor, those who saw it said it was written by the emperor himself.