A dream with a book symbolizes hidden knowledge. It suggests that you need to re-evaluate the direction you are heading in, or that you have a thirst for knowledge. The dream can also imply that you need to learn from other people's experiences as well as your own.
A spiritual book like the Koran or Bible represents sacred or hidden information. The dream suggests that you have learned something or gained understanding, or you are searching for reassurance or knowledge in some area of your life. Alternatively it can highlight your spiritual development or awareness, your interest in the unexplained, or your awareness of the principles of right and wrong.