《资治通鉴·唐纪·唐纪十》
太子喜好玩耍，不遵守礼法，于志宁与右庶子孔颖达多次直言劝谏。太宗知道后赞扬他们，各赐给黄金一斤，帛五百匹。
太子好嬉戏，颇亏礼法，志宁与右庶子孔颖达数直谏，上闻而嘉之，各赐金一斤，帛五百匹。
The prince liked to play, and did not abide by the etiquette. Yu Zhineng and Youshunzi Kong Yinda repeatedly advised him directly. Taizong praised them after he knew about it, and gave them one kilogram of gold and 500 pieces of silk each.