《北史·列传·卷五十一》
他以年老为理由提出辞职，未被允许。杨玄感反叛，炀帝将他召进军帐中，脸上现出恐惧的颜色，问他： 这个小子很聪明，能不能造成大的祸患？ 
杨玄感之反，帝引威于帐中，惧见于色，谓曰： 此小兒聪明，得不为患邪？ 
He retired because of his age, but was not permitted. When Yang Xuangan rebelled, Emperor Yang of Sui called him into his army headquarters, with fear on his face, and asked him, “This little guy is very clever, would he be able to cause a great calamity?”