"There's nothing you can know that isn't known"

This quote by John Lennon is a suggestion that understanding is not something that is unique to any someone. It is something that is shared and available to everyone. It is a reminder that we are all linked and that we can learn from each other. It is a pointer that understanding is not something that is restricted to any someone or group of people. We can all gain from each other and share our understanding with one another. It is a pointer that understanding is something that is continuously evolving and changing. We can all add to the cumulative understanding of humanity and help to form the future. It is a reminder that understanding is something that is not fixed, but something that is constantly growing and altering. It is a tip that understanding is something that is shared and accessible to everyone.