Reliving the past causes us to re-experience these feelings in the present. There are two days in every week that should be free of worry, fear, and apprehension. One of these is yesterday, which is now beyond our control. We can't go back, relive the day, or undo our actions. The second worry-free day is tomorrow, with all of its challenges, burdens, promises, and threats.
Tomorrow is also beyond our immediate control.
Today is where we should focus our energy and attention. We have one moment of power, and that is now. Preoccupation with the past and future robs us of the power of the present moment. Reliving past glories or dreaming about the future can also be stressful. If our head is in the clouds, we're likely to miss what's happening in the here and now.