The title caught my interest immediately: "Who is the Holy Spirit" rather than "What is...." It was just an interesting word choice - the "who is" - that gave me pause and caught my interest. So the book focuses on the Holy Spirit's identity; Dr. R.C. Sproul attempts to answer the question in a Biblically based manner by going back to the Bible. As most would think, The Spirit" is presented as one of the three persons of the Godhead, along with the Father and Son. Sproul continues by presenting some very basic, yet important roles the Spirit carries out, as found in both the Old and New Testaments.
Although the ideas presented are fair and well thought out, in this short work, Sproul attempts to explain some of the most complicated theological concepts in a far too brief manner. Although I enjoyed reading this book, I was still disappointed at its brevity, and the ending left me a bit flat. Regardless, for such a short work, it is well researched and very scholarly written. Sproul certainly brings out some interesting points which does make this a good book for the lay reader especially. Still, at times I still felt I was reading more about "What is" rather than "Who is the Holy Spirit."