Good advice.

There may be some event or situation from the past that still causes you pangs of guilt or regret when you think about it. So why do you keep thinking about it? For whatever reason, you just can't get past it. But you must. What's done is done. So go back to that time just once more, and acknowledge that you might do things differently now. At the same time, though, you need to recognize that you did what you did back then because it was all you knew how to do. Maybe you made a mistake. Maybe you had some weakness in an area in which you are now stronger. Forgive yourself, and move on.