What does it mean to carve a boat for a sword?

The idiom kèZhu qiúJiàn in China means that people's eyes may be out of sync with the development and changes of the objective world, and it also means rigid and inflexible.

The original source of this idiom is this:

Some Chu people waded in the river, and their swords fell from the boat into the water. They signed their names on their boat and said, "My sword fell off the boat." The ship stopped at the destination, and the Chu people jumped into the water from the marked place to find the sword. The boat works, but not the sword. If you want a sword, isn't it confusing? (Warring States Lv Buwei's "Lv Chunqiu Cha Jin")

Translation:

A man in the state of Chu crossed the river, and his sword fell from the boat into the water. He immediately carved a mark on the boat and said, "This is where my sword fell." The ship stopped at the destination, and the Chu people jumped into the water from the marked place to look for the sword. The ship has moved, but the sword has not. Isn't it silly to find a sword like this?

The corresponding idiom story:

During the Warring States Period, a Chu man crossed the river by boat. When the ship reached the center of the river, the Chu people accidentally slipped a sword they were carrying into the river. He quickly reached for it, but it was too late, and the sword had fallen into the river. The people on board are very sorry about this.

However, the Chu people seemed to have planned for a long time, and immediately took out their knives and carved a mark on the ship's side, and said to everyone, "This is where the sword fell into the water. I want to carve a mark."

Nobody understood why he did it, so they stopped asking him.

After the ship landed, the Chu people immediately launched in the marked place on the ship to catch the fallen sword. The Chu people fished for a long time, but never saw the shadow of the sword. He felt very strange and said to himself, "Didn't my sword fall from here?" I also carved a mark here. Why can't I find it now? "

After hearing what he said, those people all laughed and said, "The boat has been moving, but your sword sank into the water and stopped moving with it." How can you find your sword? "

This idiom has two meanings.

One is that if people's ideological understanding does not conform to the objective reality, they will not succeed in doing things.

On the other hand, objective reality is constantly developing and changing. If we regard the old rules and regulations as a magic weapon to solve new problems, we should also make jokes. The author's thoughts are simple materialism and dialectics.