There is an experiment: scientists put fleas on the table. Fleas jump quickly, and the jumping height is more than 100 times of their own height, making them the highest jumping animals in the world. Later, scientists put a glass cover on the flea's head and made it jump. This time, the flea can only touch the glass cover. After many times in a row, the flea finally changed its jumping height to adapt to the environment and kept it below the hood every time. Next, gradually change the height of the glass cover. After hitting the wall, the flea actively changed the take-off height. Finally, the glass cover is close to the desktop, and the flea can't jump any more. The scientist then opened the glass cover and knocked on the table again. Fleas still can't jump and become "crawling fleas".

Fleas become "crawling fleas", not because they lose the ability to jump, but because of repeated setbacks and habits, they become numb. The saddest thing is that the glass cover doesn't exist, and it doesn't even have the courage to try again. The glass cover subconsciously covered the flea's mind, and the desire and potential for action were stifled. What a terrible fact this is!

As we all know, people's different personalities are the elements that constitute human society. The development of society requires people to have their own personality. With the development of modern society and science and technology, the competition is becoming more and more fierce. Therefore, whether middle school students in the new century have a healthy personality that adapts to modern society and has a sense of modernization is the key to determine the vitality, future and hope of our Chinese nation in the 2 1 century.

The so-called healthy personality, from the psychological point of view, requires students to have the initiative in self-education and self-management; Creativity in thinking mode and practical work; In the face of difficulties and setbacks, it has the tenacity to overcome difficulties and forge ahead bravely. To develop students' healthy personality, as a class teacher, we must strive to create a mature, relaxed and adaptable objective environment.