《旧唐书·本纪·卷二》
行台司勋郎中杜如晦等十八人为学士，每次在阁下轮流值班，太宗则降低身份以温和态度与学士们讨论经义，有时谈论到半夜才结束。
行台司勋郎中杜如晦等十有八人为学士，每更直阁下，降以温颜，与之讨论经义，或夜分而罢。
Eighteen people were selected as scholars, including Du Ruhui, the Minister of Personnel of Xingtai Province. They took turns on duty in the pavilion, and Emperor Taizong humbly discussed classics with them in a温和 manner, sometimes until midnight.