What is done is done

We cannot change past conduct in our lives. What is done is done. Where possible (and it is not always possible) we can attempt to mitigate the effects of our misconduct, but we cannot change it. "Learning from our mistakes" is good, but it is a poor second-best to listening to our elders and learning from them and doing things right to start with. All the learning from our past conduct that we could do cannot remove scars.