This author is superb as long as he sticks with the subject of his books, i.e., "The Holy Spirit", but he occasionally broadens his subject... and when he does it does not go well. When we covered the first few chapters, we (my class of 8-10 adults) thought it was one of the very best studies we have ever done, but as we progress toward the back of the book, we have changed our minds. Perhaps I could check back again when we have finished the book -- in 2-3 weeks (we use this curriculum on Sundays).