In any given decade of the market, there’s bound to be 2-3 “bad years” for investing. But we are not fortune tellers. Nobody in the world knows what’s going to happen tomorrow, next year, or next decade. You just keep investing and in the long run… you’ll come out on top. If you read Common Sense Investing by John C. Bogle (founder of Vanguard and index funds), you’ll learn and understand that is an absolute fact.