If you ask people to tell you about their happiest memories, you will find out that almost every happy moment has nothing to do with money. This shows money is not the main source of happiness. Our assumption always deceives us. You may think I will be happier if I have more money. I will live abundant life if I win a lottery. Once, you have your money, you start to stress about how to spend them, worrying others ask to borrow your money, and wonder how to keep your money save…etc.