《贞观政要·卷一·论政体》
魏徵觉得这些话说得还不透彻、清楚，还不足以让太宗明白其中的道理，便又向太宗上奏道： 晋文公出去打猎，在砀山这个地方追赶野兽，进入了河水交错的地方，迷失了道路，不知道该从哪儿走出去。
又奏称： 晋文公出田，逐兽于砀，入大泽，迷不知所出。
Wei Zheng did not think that he had clearly expressed his words and made his point, and so he memorialized to Emperor Taizong again: Duke Wen of Jin went hunting and chased after a wild beast at Dang Mountain. He ran into a crossing river and lost his way, not knowing which way to go.