Every memory is precious. Whether it is a bad one or a good one, they overall shape us for who we are today. So don't let any of them go.
Precious memories. Think of a memory as a power, only you can relive the experiences that you have been through, whether to please you aesthetically, to grab wisdom by using your past experiences to help you make new decisions, help interact with other people, or to help with problem solving. We keep memories for a variety of reasons sometimes to hold on to the things we love the things that have made us who we are and who we never want to lose. It is kind of like how Oscar Wilde says "memories are small diaries that we will keep in our heads always."