《金史·列传·卷二十三》
金世宗高兴地对豫国公主说 ：皇太子显宗很孝顺且有德行，选派他的两个儿子，既而又派永中的儿子来问安，他们兄弟像这样友爱。 
世宗喜谓豫国公主曰： 皇太子孝德天成，先遣二子，继遣此子，兄弟之际相友爱如此也。 
Emperor Shizong of the Jin Dynasty was glad to say to the Princess Yu of the Tang Dynasty: The crown prince Emperor Xianzong is very dutiful and virtuous, he selected his two sons, and then sent Yongzhong’s son to ask after him, they are so amicable brothers.