"I have read and reread Dr. Simpson's book, The Life of Prayer, with the deepest interest and profit. No one can give this book a careful reading without realizing that the author has lived in the secret of his Master's presence. Every page makes it evident that here is a man who has prayed through. Down through the Christian centuries few men have had greater prayer results. Great would be the spiritual quickening if every Christian mastered this classic on the prayer life." Jonathan Goforth