Some people like to keep their books clean, I like to pencil in my thoughts on the margin and underline a passage that appeals to me. I can’t agree more that reading is a continual conversation with the author. Not only dies reading encourage critical thinking it also provokes a response.
I cannot agree more with this Time Magazine article about writing in your book. Marking my book is indispensable. I’m interacting with the author and what is written. I own almost all the books so I am not guilty about marking them.