What did Confucius mean when he said that he knew his destiny at sixty?

Confucius said, "You know your destiny at the age of 60", which means you know your destiny at the age of 60. This fate refers to the tasks or goals to be accomplished in a person's life, as well as the courses and experiences that need to be experienced to achieve these tasks or goals.

Confucius believes that a person should be determined to learn when he is young and accumulate knowledge and experience constantly, so that he can stand on his own feet in middle age and reach the transcendental realm in old age. At the age of 60, he deeply realized his destiny, that is, to change the society through the influence of education, morality and politics, so as to make the society more just, harmonious and progressive.

Therefore, "knowing destiny at the age of 60" can be understood as Confucius' summary of his own life experience and a clear understanding of his future tasks.