What is the story of Xu Wan's wisdom?

Wang Wei decided to build a very high platform, which is exactly half the distance between heaven and earth, and named it "Zhongtai". Many people found Wang Wei's decision ridiculous, so they all came to dissuade him. Wang Wei is very angry. He ordered, "Whoever opposes my decision again will be beheaded!" " In this way, everyone is afraid to say anything more, just worried.

One day, a man named Xu Wan came to the palace with a shovel and a basket on his back and asked to see Wang Wei. He said to Wang Wei: "I heard that the king is going to build a' zhongding', and I am willing to help him."

Wang Wei was very happy to see the first person who came to help build the high platform. Wang Wei asked him, "What strength can you help me?"

Xu Wan said, "I don't have much power, but I can help your majesty discuss the plan to build a Taiwan."

Wang Wei quickly asked him happily, "What do you think? Come and listen to me. "

Xu Wan said unhurriedly, "Your Majesty, before you build a high platform, you must wage a large-scale war."

Wang Wei said inexplicably, "What do you mean?"

Xu Wan said, "Please listen to my analysis. It is said that the distance between heaven and earth is 65,438+05,000 Li, and the height of the terrace in the middle is half of it, which is 7,500 Li. To build a platform with a height of 7,500 Li, the platform foundation of Fiona Fang must be 8,000 Li. Take out all the existing land kings, which is far from enough to be a base in Taiwan Province. The vassal state established by Yao and Shun in ancient times has a total land area of only 5,000 Li. If the king wants to build a rooftop, he must first send troops to crusade against the vassal States and occupy all the land of the vassal States. That's not enough. We must attack the remote countries from all directions again, before we get 8000 miles of land in Fiona Fang as a platform. In addition, the materials and manpower needed to build a platform and the food that people who build the platform need to eat can be calculated in billions; At the same time, crops can only be planted on land 8,000 miles away from Fiona Fang, and a large number of Taiwan Province builders have to support themselves. I wonder how much land is needed. All these must be prepared before the construction of the high platform begins. Therefore, you should start a large-scale war first. "

When Xu Wan said this, Wang Wei was dumbfounded and couldn't say a word. Of course, Wei Wang later gave up the idea of building a rooftop in China.

Xu Wan persuaded Wang Wei to convince others by persuasion and persuasion, and made Wang Wei understand that the "Tiantai" he wanted to build was just a blind and reckless project, and it was certainly impossible to achieve it without objective basis.