"When you've finished tidying your books, step back and take a good look at your bookshelves. What kind of words leap out at you from the titles on their spines? [...]
The energy of book titles and the words inside them are very powerful. In Japan we say that 'words make our reality'. The words we see and with which we come into contact tend to bring about events of the same nature. In that sense, you will become the person who matches the books you have kept. What kind of books would you want in your bookcase to reflect the kind of person you aspire to be? If you choose which books to keep on that basis, you may find that the course of events in your life changes dramatically."
Food for thought there from Marie Kondo's Spark Joy.