Confucius said: "When I was fifteen, I was determined to learn; when I was thirty, I was established; when I was forty, I was not confused; when I was fifty, I knew the destiny of heaven; when I was sixty, my ears were obedient; when I was seventy, I followed my heart's desires without exceeding the rules." -- "The Analects of Confucius·Wei Zheng"

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Interpretation: I am fifteen years old and am interested in learning; at thirty years old, I (understand etiquette and) have confidence in what I say and do; four At the age of ten, (master all kinds of knowledge), you will not be confused; at the age of fifty, you know the destiny; at the age of sixty, you can distinguish between true and false, and distinguish right from wrong; at the age of seventy, you can do whatever you want and have any thoughts They won't go beyond the rules. This is a general summary of Confucius's lifelong learning and cultivation in his later years. It shows that he never stopped learning and cultivation throughout his life, and made great progress every once in a while until he reached the highest level in his later years. For thousands of years, countless people have used this passage as a motto to encourage themselves. Among them, "erli", "not confused", "zhiming" and "earshun" have become synonymous with thirty, forty, fifty and sixty years old respectively and are widely circulated.