Happiness
Happiness is worth thinking about. Nothing else is as important to your health, your relationships with your spouse, your relationships with your children, your longevity, your general well-being, your effectiveness at your career.
The happiest people I know are people who approach life from a solid core. They start with the core fundamentals - making sure they have good habits, good relationships with their family, their spouse, their children.
They make sure that they have their finances in order.
Then, they move outwards toward their friends.
Then, with a solid core, they reach out to be effective in their jobs, etc.