For the last few weeks, I’ve been working my way through David Crump’s book Knocking on Heaven’s Door: A New Testament Theology of Petitionary Prayer. Dr. Crump’s a religion professor at Calvin College in Grand Rapids, MI, and he’s written a truly superb book; there’s more meat in the introduction alone than you’ll find in many books on prayer. I picked it up after reading Lauren Winner’s review, thinking it could give me a useful frame for a sermon series, and that’s been one of the better decisions I’ve made lately. I will indeed be leaning on this book in my preaching this summer, but it’s done me a lot more good than just that; I can honestly say my prayer life is stronger and deeper as a result of the reading I’ve done so far, and I look forward to seeing what Dr. Crump draws out of the rest of the New Testament. Highly recommended.