"Why do you cling to pain? There is nothing you can do about the wrongs of yesterday. It is not your to judge. Why hold on to the very thing which keeps you from hope and love?" - Leo Buseaglia
I think that it is very important for people to remember that we cannot change the past. We go through life's experiences - good and bad, happy and sad, and move on. Life moves on, so should we. We can, however, focus our time, energy, and focus on the present and the future. If we made mistakes in the past, we should have learned from those experiences, and don't repeat them again. Our past is a great teacher which can us to prepare for the future, as long as we are ready and willing to learn and let go of the past, while focusing on what's ahead of us instead.