Know life, a gentleman who plays it by ear, how to understand it?

The understanding of "a gentleman plays it by ear, but he can master know life" is as follows:

A gentleman can see the subtle, and a wise man knows the destiny.

"A gentleman plays it by ear" comes from "What a gentleman sees is what he gets" in the Book of Changes. "Genius knows life" comes from "Happiness knows life, so I don't worry" in the Book of Changes.

Therefore, if you know your destiny, you will be able to take action to improve your destiny by not complaining about God, not being rude to others, being happy with everything, and knowing the subtle signs in your life.