《南齐书·列传·卷五十三》
褚渊经常拜访虞愿。一次虞愿不在，褚渊看见他床铺上积满灰尘，上面摆放着好几套书。
褚渊常诣愿，不在，见其眠床上积尘埃，有书数帙。
Chu Yuan often visited Yu Yuan. Once, when Yu Yuan was not home, Chu Yuan saw that his bed was covered in dust, and several sets of books were placed on it.