Jems Albi's Key Ideas from The Psychology of Money
by Morgan Housel

Life isn't any fun without a sense of enough. Happiness, as it's said, is just results minus expectations.

"Enough" is realizing that the opposite- an insatiable appetite for more- will push you to the point of regret.

The only way to know how much food you can eat is to eat until you're sick. 

Reputation is invaluable.

Freedom and independence are invaluable.

Family and friends are invaluable.

Being loved by those who you want to love you is invaluable.

Happiness is invaluable.

And your best shot at keeping these things is knowing when it's time to stop taking risks that might harm them. Knowing when you have enough.