子曰：“吾十有五而志于学，三十而立，四十而不惑，五十而知天命，六十而耳顺，七十而从心所欲，不逾矩。”

Confucius said, “Since the age of 15, I have devoted myself to learning; since 30, I have been well established; since 40, I have understood many things and have no longer been confused; since 50, I have known my heaven-sent duty; since 60, I have been able to distinguish right and wrong in other people’s words; and since 70, I have been able to do what I intend freely without breaking the rules.”