A steady water drip can drill a hole through a rock over time. There is power in a steady drip. This timeless truth was written about as far back as the fifth century when classical writer, Choerilus of Samos, wrote, 'with persistence a drop of water hollows out the stone.' There is a great investment strategy in this thought, as well. It's the consistent investing of the same dollar amount on the same day each month or quarter automatically in what is called dollar-cost averaging.