《逸周书·卷三·寤儆解》
周公说： 天下人不会想到周会叛商，惊梦是让王清醒，王要重天命。
周公曰： 天下不虞周，惊义务不王，王其敬命，奉若稽古维王。
The Duke of Zhou said: The people of the world would not have thought that Zhou would revolt against Shang. The terrifying dream was to wake up the king, so that the king can revere the Mandate of Heaven.