Who teaches others to teach others swimming lessons?

The class that teaches axe refers to: Lu Ban.

Idiom story:

Lu Ban was a skillful craftsman during the Spring and Autumn Period and the Warring States Period. Until now, people still say that Lu Ban is the ancestor of carpenters. At that time, there was a craftsman named Shi named Jiang. He comes from Du Ying, the capital of Chu, and it is said that his skills are inseparable from Lu Ban. How high is his skill?

It is said that this stonemason has a good friend and they often perform together. The friend thinly coated the tip of his nose with white ash. The craftsman held an axe in his hand and aimed it at the tip of his nose. Suddenly, he swept the white ash off the tip of the nose with an axe, and even the skin on the tip of the nose could not be wiped. This shows how capable he is. Therefore, Liu Zongyuan later said that if someone with an axe dared to play tricks in front of Ruban and Du Ying's craftsmen Shimen, it would be a bit overreaching.

Idiom moral:

This idiom tells people to learn to be modest and not to show off their skills in front of others casually, otherwise they will probably teach others to joke. People often say, "shine on you is better than blue." An ordinary motto contains profound truth, that is, the problem of inheritance and development.

Old things are the support of the development of new things, and new things are the result of the development of old things. They are closely related and have the function of connecting the past with the future. It is not advisable to stick to the rules and be passive. Everything should be based on the idea of seeking advice from our predecessors with an open mind, and then it is reasonable to seek development and innovation on this basis. It is one-sided to emphasize any one aspect alone.