The asset is the only thing that will bring cash flow in every month. Investments are more critical as the Increase in Assets decreases the Liability: the more Asset, the more money cash flow. But many people don't know that many Assets can bring money to us in a Passive way. According to Warren Buffet, " If you don't find a way to make money while you sleep, you will work until you die." So, Passive income is significant.