“It’s important that there is a memory, and that it can be visited. That doesn’t mean that every memory should be returned to, any more than the existence of a library means you should read every book in it. Exercise discretion. I’ve walked enough of my own past to know it to be a path that will cut you. Even the softest recollection can conceal a blade, if only for the fact that it is gone, and those moments will never be yours again.”