Book excerpt: Eschewing extremes, Bible scholar D. A. Carson explores the controversial subject of the role of the Holy Spirit in the life of a believer and in the life of the church. Unpacking 1 Corinthians 12-14, as well as touching on relevant passages in Acts, Carson faithfully follows the evidence of the text and offers an honest look at the strengths and weaknesses of both charismatic and non-charismatic viewpoints.