《资治通鉴·唐纪·唐纪十》
庚子，太宗在洛阳宫西苑饮宴，在积翠池泛舟，对大臣们说： 隋炀帝修筑此宫苑，与百姓结下积怨，如今全都归我所有，正是因为宇文述、虞世基、裴蕴之流在宫内谄谀，在宫外堵塞君主视听的缘故，能不引以为戒吗？ 
庚子，上宴洛阳宫西宛，泛积翠池，顾谓侍臣曰： 炀帝作此宫苑，结怨于民，今悉为我有，正由宇文述、虞世基、裴蕴之徒内为谄谀、外蔽聪明故也，可不戒哉！ 
On Gengzi, Taizong held a banquet in the western garden of Luoyang Palace. He sailed on the Jicui Pond and said to the ministers: "Emperor Yang of Sui built this palace garden, which has caused resentment among the people, and now it all belongs to me. The reason is that Yuwen Shu, Yu Shiji, and Pei Yun have been flattering in the palace and blocking the monarch's vision outside the palace. How can we not learn from it?"