It would be wonderful if we could avoid the setbacks with timely exits, but nobody has figured out how to predict them. Moreover, if you exit stocks and avoid a decline, how can you be certain you’ll get back into stocks for the next rally? Here’s a telling scenario: If you put $100,000 in stocks on July 1, 1994, and stayed fully invested for five years, your $100,000 grew into $341,722. But if you were out of stocks for just thirty days over that stretch—the thirty days when stocks had their biggest gains—your $100,000 turned into a disappointing $153,792. By staying in the market, you more than doubled your reward. Peter Lynch.