《旧唐书·列传·卷十五》
长孙无忌是皇家后裔，自幼好学，博览文学历史，秉性豁达机敏，富有计谋。
无忌贵戚好学，该博文史，性通悟，有筹略。
Changsun Wuji was a descendant of the royal family, studious since childhood, and widely read in literature and history. He was open-minded, quick-witted, and resourceful.