Suddenly I found that it is very difficult to change a person's cognition. When the A-share market was at 2700 points, my friend was advised to buy stocks, such as Moutai, Tuowei, and brokerages. After three days of persuasion, she didn't buy. When the market started to rise, she regretted it and said that she would buy stocks after a pullback. I advised her to buy stocks quickly and buy stocks in different positions so as not to miss out on opportunities. She could also increase her positions after a pullback, but she didn't listen. After three days of rising prices, she suddenly told me that she had bought stocks at the ceiling. After the holiday, she changed her positions again. I knew that she was just here to give money to the market, so I told her to quit quickly. She didn't listen. I knew it was too difficult to change her cognition.