《北史·列传·卷四十三》
孝昭帝掌握朝中大权以后，朝臣们大多秘密劝他即皇帝位，独有彦深却不进言。
孝昭既执朝权，群臣密多劝进，彦深独不致言。
After Emperor Xiaozhao took control of the court, most of the officials secretly urged him to claim the title of emperor. Only Yan Shen kept his silence.