We should learn from our errors, but we ought to forget them as soon as we can. There may be some value in "instant replay" in order to learn what we can and then move on. But some of us engage in "constant replay," which can be enervative and destructive of our self-confidence.
It is strange that when one is remodeling a portion of his house, he expects visitors to be tolerant of improvements that are so obviously underway. Yet while one is remodeling his character, we often feel obligated to call attention to the messy signs of remodeling, or feel called upon to remember aloud things as they were. Forgetting is such a necessary part of forgiving.