《隋书·列传·卷二十二》
后来，高祖夸奖他很称职，对杨素、牛弘说： 道衡老了，为国奔走，很辛苦，应该让他家的大门口有人持戟站岗。 
后高祖善其称职，谓杨素、牛弘曰： 道衡老矣，驱使勤劳，宜使其硃门陈戟。 
Later, Gaozu praised him for being very competent and said to Yang Su and Niu Hong: "Daoheng is old and works hard for the country. He should have someone stand guard at the gate of his house with a halberd."