An informative, clarifying, and unifying book on the Holy Spirit Who is the Holy Spirit and what does he do? The world-renowned evangelist Billy Graham offers a sensitive and comprehensive portrait of the much discussed but often-misunderstood member of the Trinity. The Holy Spirit came to empower God’s people and transform their lives, yet so often the doctrine of the Holy Spirit causes division in the church. It is crucial to develop a genuinely biblical understand of the Third Person of the Trinity—and to experience an authentic outpouring of his power.