There is a story about the origin of leather shoes: Before the invention of shoes, people walked barefoot and had to endure the pain of their feet being pricked and ground. In a certain country, a eunuch covered all of the king's rooms with cowhide to please him. The king stepped on the cowhide carpet and felt extremely comfortable with his feet.

In order to make himself feel comfortable wherever he goes, the king ordered that all the roads in the country be covered with cowhide. All the ministers were at a loss after hearing the king's words, knowing that it was even harder than ascending to heaven. While the ministers were racking their brains to persuade the king, a clever minister suggested that the king could try wrapping his feet in cowhide and tying them tightly with a rope, so that his feet could also be protected from pain. So, shoes were invented in this way.

Covering all the roads in the country with cowhide, although it can make the king's feet comfortable, is still a foolish and wasteful method. That minister is smart. It's much easier to change his feet than to pave the roads of the whole country with cowhide. According to the second method, as long as a small piece of cowhide is used, it will have the same effect as laying the entire world on cowhide. Many times, we can adapt to the environment by changing ourselves.