Luther wrote a little booklet entitled “A Simple Way to Pray” and Keller makes extensive use of it. Near the end of chapter 6, he mentions that Luther taught that one should always be alert and ready to hear the preaching of the Holy Spirit within. While in prayer, a believer can suddenly be overcome by good and edifying thoughts and then he or she should sit still and listen. Says Luther, “The Holy Spirit himself preaches here, and one word of his sermon is better than a thousand of our prayers. Many times I have learned more from one prayer than I might have learned from much reading and speculation.” This is one of the most abused quotes of Luther. Authors like Sarah Young (in Jesus Calling) appeal to this quote to justify their belief that God has spoken directly to them. Luther was often given to very expressive and over-the-top language and I doubt that he wished to provide support to the modern-day descendants of those Anabaptists who claimed to receive direct revelation from God. Instead, Luther’s intent was to remind Christians of how we may sometimes receive illumination from the Spirit – he can sometimes enlighten our hearts and bring us to breakthroughs in our understanding of spiritual truths found in God’s Word. I’m convinced Keller knows this too: “Luther is talking about the eyes of our hearts being enlightened (Eph. 1:18) so that things we know with the mind become more fully rooted in our beings’ core” (96). Yet, because this quote is so easily misunderstood with its use of the word “preach,” I wish that Keller had explained more clearly that this is not speaking of extra-biblical revelation and gives no support to those, like Sarah Young, who claim that the Lord spoke to them in their quiet time.
—Wes Bredenhof, Book Review: Prayer