Negativity inhibits positive development, especially those with high positive potential: Edison, the greatest inventor, was expelled from school in the second grade of primary school because of his low intelligence. When Edison was expelled from school, the teacher suggested that Edison’s mother send him to a special school for children with low intelligence. Albert Einstein, the greatest scientist, had scored 3 points in a very low grade. The teacher said in front of the class that Einstein was doomed to achieve nothing in the future. When Einstein was a sophomore at Arauld Middle School in Germany, because his father’s job changed, Einstein told the school teacher that he was going to transfer to another school, and the teacher told him that the school was also preparing to expel him. Einstein failed in the university entrance examination and only went to university after a year of re-education. Van Gogh, the greatest painter, had mental problems, cut off his ears, and was destitute all his life. Only after his death did his paintings become famous. Beethoven, the greatest musician, became deaf, deaf, biting sticks with his mouth, touching the piano, feeling the vibration and judging the sound.