The main message is that the happiness is determined by 3 factors 1. Money you own 2. Human capital i.e. the potential to earn money 3. People surrounding you
The most impressive message is that people can only be good at what they like because you will put time without much attention. This cannot be overcome by the normal people trying hard to practice. What do I like? I like finance and piano. I want to know more and more about them.