I had to make a mental adjustment and it went like this.... "Am I going to read this book again? Or am I going to ever read this book?" - if the answer was no, then I considered I was depriving the world of a book, I was hurting its feelings and it wasn't being allowed to do what it was put on this earth to do. Rather than decluttering, I was liberating trapped books and releasing them from their shelfy-prisons. Many of my books are now in similar public libraries being read by people who aren't me. :o)