I don't know what your destiny will be but one thing I know: the only ones among you who will be really happy are those who will have sought and found how to serve.
- Albert Schweitzer
Money doesn't buy happiness. You are happy when you're doing something you like, but joyous when you help and serve others. If someone is destined to be a millionaire and they spend that money on themselves, they won't be truly happy. However if they donate to charities or supply necessities to shelters, they will only then by truly happy.
If somebody lives by this quote, they will not only improve their life and boost their happiness, but also work towards helping others and possibly change the world.