《旧唐书·本纪·卷四》
太宗每次上朝，常令晋王在旁边，让他观看自己决断各种政务，有时候让他参加议事，太宗多次称赞他好。
太宗每视朝，常令在侧，观决庶政，或令参议，太宗数称其善。
Every time Taizong ascended the court, he would often order Prince Jin to be present, to observe him resolving various state affairs, and sometimes have him participate in discussions. Taizong praised him many times as being good.