If I know you well, your relationship to life is mainly through understanding. Which you either have or not.
When you do, you are happy, even though you are just as unsuccessful living well, being fulfilled as you were before.
When you hear something, when you see something, you try to understand it. When people do something, stupid, smart, hurtful, you want to understand why they did it. Don’t you?
When you read, you try to understand it.
People who are successful, high achievers, they don’t try to understand, they may not understand at all.