guides. In a world inundated with resources that are just a few keystrokes away, one of the challenges we face is deciding to whom we should listen. Pastor and theologian Tim Keller rightly recognizes the importance of this question: When you listen and read one thinker, you become a clone. If you really spend a lot of time listening and reading two thinkers, you become confused. If you really spend a lot of time in reading and listening to about ten thinkers, you’ll start to develop your own voice.