A concrete description of the movement, its origins, development and current status, including warm, personal testimonies of many who have experienced the manifestation of the Spirit in their own lives.

One of the early Catholic Charismatics, Fr. O'Connor used this book in part of refute the psycho-pathological model of glossolalia. The movement has changed so much in the last 40 years, that I doubt this book has much value except historical. ( )