(Confucius said): "When I was 15 years old, I was determined to study. When I was 30 years old, I could stand on my own in the world. When I was 40 years old, I was not confused when I encountered difficulties. When I was 50 years old, I understood what destiny is. When I was 60 years old, I could live on my own. When you are able to listen to different opinions, you can do whatever you want at the age of 70, and you can do whatever you want without going beyond the rules."

Confucius said: "I began to study when I was fifteen; At the age of 40, you can be independent in the world; at the age of 40, you will not be confused when encountering problems; at the age of 50, you will understand what destiny is; at the age of 60, you can listen to different opinions; at the age of 70, you can do whatever you want. Whatever you do, it won't go beyond the rules.