《汉书·志·艺文志》
《易》上说： 天下归宿相同而道路各异，思想一致但思考不同。 
《易》曰： 天下同归而殊涂，一致而百虑。 
The Book of Changes says: The destination of the world is the same, but the paths are different; ideas are in agreement, but thinking is different.