Keller has broken The Lord's Prayer down into twelve chapters. Each one goes into great depth around that particular phrase. For example: The first chapter is called 'Our Father'. Keller discusses the change in perception of God from someone remote and distant before Jesus, to someone who wants us to call Him father, and what that really means for us. He delves into the prodigal son to illustrate this. He is very grounded in scripture throughout and his writing style is very interesting and very thorough.
This is a great book for really meditating on scripture or would be great for those learning to meditate on scripture too.
I would definitely recommend this book. Can't get enough scripture into us I'm thinking!
You can buy this book here