《新唐书·列传·卷二十六》
然而炀帝一直打算征讨辽东，又恨萧瑀乘着献计干扰他的机谋，对群臣说： 突厥能怎么样，萧瑀乘它还没解围来恐吓我！ 
然帝素意伐辽，又衔瑀以谋擫其机，谓群臣曰： 突厥何能为，瑀乘未解时乃绐恐我！ 
However, Emperor Yang had always planned to conquer Liaodong, and he also hated Xiao Yu's plot to interfere with his strategy, so he said to the ministers: What can the Turks do? Xiao Yu used it to scare me before it was lifted!