Inspired by Stephen Merritt's Challenge at the Old Orchard Camp meeting that The Book of The Holy Ghost is Yet Unwritten, A.B. Simpson Launched into one of the greatest writing efforts of his life. In 1895 the first volume of The Holy Spirit was produced, followed by the second volume the next year. Now available in one volume and in paperback, Simpson's masterpiece has established him as one of the most prolific writers on the Holy Spirit of the past 2 centuries.