Peter Drucker One problem with gazing too frequently into the past is that we may turn around to find the future has run out on us. Let others argue over small things, but not you. Let others cry over small hurts, but not you. Let others leave their future in someone else's hands, but not you. Yesterday is history.
Tomorrow is a mystery.
Today is a gift. That's why we call it the present. The future is not something we enter. If you don't take charge of shaping your own destiny, others will apply their agenda to you. It comes soon enough.