What does it mean to stand at 30, not be confused at 40, know your destiny at 50, and be obedient at 60?

(Confucius said): "When I was 15 years old, I was determined to study. At the age of 30, I was able to stand on my own feet. 40 years old, not confused. At the age of 50, I understood what fate was. At the age of 60, I can listen to different opinions. At the age of 70, I can do anything I want without going beyond the rules. "

The original text is from the second chapter of The Analects of Confucius, Governance.

Confucius said, "I am determined to learn from five out of ten, to stand at thirty, to be puzzled at forty, to know my destiny at fifty, to be obedient at sixty, and not to overstep my bounds at seventy."

Note: Li: It means standing. Not confused: master knowledge and not be confused by foreign things.