《新唐书·列传·卷一百二十一》
得到书籍熟读后再抄录，在书海中勤于勘校，朱笔黄纸不离手，藏书虽少，其精华程度都可传世。
得书熟诵乃录，雠比勤勤，硃黄不去手，所藏虽少，其精皆可传。
After getting a book, he would read it carefully and then copy it. He was diligent in collating in the sea of books and always had red pencils and yellow paper in his hands. Although he had few books, their essence could be passed on.