⁶A fun and informative essay to read on this subject is Mortimer Adler’s How to Mark a Book, widely disseminated on the Internet. In it, Adler argues persuasively for the habit of annotating the books you read, and gives some practical tips for doing so. He says reading a book should be a sort of conversation with the author where the flow of information is not just from the author to you, but also from you to yourself as you question, consider, and even argue the author’s points.