Let me roughly divide books into those which compete with the movies and those with which the movies cannot compete. They are the books that can elevate or instruct. If they are fine works of fiction, they can deepen your appreciation of human life. If they are serious works of nonfiction, they can inform or enlighten you.
If you ask a living teacher a question, he will probably answer you. If you are puzzled by what he says, you can save yourself the trouble of thinking by asking him what he means. If, however, you ask a book a question, you must answer it yourself. In this respect a book is like nature or the world. When you question it, it answers you only to the extent that you do the work of thinking an analysis yourself.