1968, Rosenthal, an American psychologist, came to a rural primary school to test the language ability and reasoning ability of students of all grades. After the test, he randomly selected 20% students and told their teachers that these children have great potential and may be more promising than other students in the future. Eight months later, Rosenthal came to this school again. Miracle appeared, and the scores of 20% students he randomly assigned improved obviously. This experiment is called "Ugly Duckling Experiment", also called "Rosenthal Experiment".

Why is there such a magical result? What matters is the teacher's expectation. Teachers believe in the expert's conclusion and that the designated children have a bright future, so they place higher expectations on them, put more enthusiasm into them and give them more encouragement. In turn, these children's self-confidence has been enhanced, so they make progress faster than other 80% students.

This experiment tells us that encouraging others with a positive attitude may lead to improvement in a positive direction; On the contrary, negative and excessive criticism and attacks will also lead to elimination, especially for those minors who lack self-control ability.

Positive encouragement is a kind of goodwill, and too much criticism and blow is a kind of malice. Successful educational methods are mostly based on understanding, respect and concern, and are a kind of "good" education. Because good is huge energy, and evil is also huge energy, which can change the "magnetic field" around you.