The individual investor should act consistently as an investor and not as a speculator.
In the short run, the market is a voting machine, but in the long run, it is a weighing machine.
Though business conditions may change, corporations and securities may change, and financial institutions and regulations may change, human nature remains the same. Thus the important and difficult part of sound investment, which hinges upon the investor's own temperament and attitude, is not much affected by the passing years.