玉书比知画美
[yù shū bĭ zhī huà mĕi]
Refers to a comparison of 'Yushu' and 'Zhi Hua', both of which seem to be derived from characters' names. 'Yushu', meaning jade book, implies this character/personage might possess qualities of purity, wisdom, or charm exceeding Zhi Hua.