Confucius said, "I am determined to learn from five out of ten, stand at thirty, not be confused at forty, know my destiny at fifty, listen to my ears at sixty, and do what I want at seventy without overstepping the bounds."
Interpretation: at the age of fifteen, I am determined to study, and at the age of thirty, I can stand on the world according to the etiquette requirements. At the age of forty, I am no longer confused about anything. At the age of fifty, I learned what human resources can't control. At the age of sixty, I can listen to different opinions. At the age of seventy, I can do whatever I want without overstepping the bounds.
Source: The Analects of Confucius
The Analects of Confucius: The Analects of Confucius was compiled by Confucius' disciples and his disciples, and was written in the Han Dynasty. It mainly records the words and deeds of Confucius and his disciples and reflects Confucius' thoughts more intensively. It is one of the classic works of Confucianism. It is mainly based on quoting classics and supplemented by narration, which embodies Confucius' political opinions, ethical thoughts, moral concepts and educational principles. It is called "Four Books" together with the Five Classics such as Daxue, The Doctrine of the Mean, Mencius, and The Book of Songs, Shangshu, Book of Rites, Zhouyi and Chunqiu. The book, with 20 articles and 492 chapters, is the first "bibliography". It is one of the ancient works that China is spreading and learning.