Don't you hate when you read something that resonates but forget where you read it? I read something earlier in the year that struck a chord and has stayed with me all year.
Did you ever read a book that a friend raved about and you were like meh...? And vice versa, had friends not be enthralled by the books you love? Have you ever hated a book but then give it a second try and adore it?
The passage in the book was along the lines that you form a sort of relationship with a book. That you "meet" the book, and the experience of reading the story is largely based on your own life; how relatable it is. That every reader has a different perception of the book.
Books are like people, perhaps.