Our heads are like book-shelves. Every now & then some books get out-dated or they're no longer enjoyable, interesting or useful to you so you need to have a clear-out to make room for some more that are in the same way that some of the information we've stored in our heads gets out-dated or is no longer enjoyable, interesting or useful to you so you need to clear it out to make room for new, up-to-date, enjoyable, interesting or useful information. People often think that writing cements information into our heads but it can also help us forget stuff we no longer want to remember as if we write it down we think we no longer have to remember it & then we can throw the rubbish away or shred it. It feels so good.