There is a difference between thinking about the past and living in it. Sometimes we live in the past because it's familiar -- we know what happened; there are no surprises. Think about why you watch your reruns of your favorite old sitcoms over and over again.

This is what happens when we live in the past. We choose to live there because it's familiar. We know everything that happened. When the past was really good, you can live there because just thinking back on it gives you a feeling of comfort and happiness.