《贞观政要·卷五·论孝友》
贞观七年，任寿州刺史，唐高祖死后，他放弃了官职，并且常常穿粗布衣服，以此表示对高祖的悲戚和怀念。
贞观七年，为寿州刺史，属高祖崩，去职，毁瘠过礼。自后常衣布服，示有终身之戚。
In the seventh year of Zhenguan, he was appointed governor of Shouzhou. After the death of Emperor Gaozu of Tang, he gave up his official position and often wore coarse cloth clothes to express his grief and remembrance of Emperor Gaozu.