Marie Kondo

To truly cherish the things that are important to you, you must first discard those that have outlived their purpose. And if you no longer need them, then that is neither wasteful nor shameful. Can you truthfully say that you treasure something buried so deeply in a cupboard or drawer that you have forgotten its existence?

Many of Judy Blume's books - which I devoured when I was growing up and where I found characters that were believable because they were a lot like me - caused considerable consternation when they were first published, but now they're widely accepted as an essential part of the children's literary canon.