《资治通鉴·晋纪·晋纪三十七》
左右的侍从告诉拓跋嗣说： 皇上非常气愤，你如果进去的话，结果恐怕不好预测，不如暂时回避一下，等皇上的怒气平定之后再进宫。 
左右曰： 上怒甚，入将不测，不如且避之，俟上怒解而入。 
The eunuchs told Tuoba Si: The emperor is very angry. If you go in now, the outcome might be difficult to predict. It would be better to wait a while, until the emperor's anger subsides, and then go to the palace.