Best book I have read on prayer. (Not that I have read many, but this ,by far, tops them) I like how Mr. Keller doesnt try to make it easy or gimmicky but just lays out how some of the old saints did it. (Martin Luther, John Owen and Augustine are most prominent) Its alot to digest so I would hope that you actually own the book (I read mine through an e-library) so that you can go back and reference it. Great book.