If you want to know the history of the Pentecostal movement then this will be a great book to read or to consult. Important to see is that the holiness movement lies underneath the modern-day Pentecostal movement. The history of this church movement is quite complex as it is often chaotic. It seems like a movement that is always on the run. Then what we can learn from the early tongues is that it was almost always recognised as a known language. The book talks primarily about America and also touches quickly other parts of the world. Since the USA can be seen as the womb from which the movement was born. Pentecostalism is for many people an exciting religion with many signs and wonders. However, much is based on the subjective, while the Reformed teachings are based mainly on the objective point of view. This subjective aspect can be also responsible for the many heresies that sprung out of the movement. For example, what the book called the “Jesus Name” sermon. Explanation from the book on page 157: "According to Ewart’s view there was only one personality in the Godhead—Jesus Christ—the terms “Father” and “Holy Spirit” being only “titles” used to designate various aspects of Christ’s person. Therefore, the idea of a “trinity” was a mistake which had been foisted on the church by the Bishop of Rome at the Council of Nicea in A.D. 325." The danger is that someone charismatic is getting a vision and declares with much power a heresy where many untrained members will blindly follow. As happened with the example above. Next, the book explains the theology well of the Pentecostals. Added that the Pentecostal movement later on also got much ground in the Catholic Church and many Protestant church denominations. Even David Wilkerson is related to the movement. The strange things for me are (for some churches) the prohibition of medicine, holy laughter, animal sounds, grabbing poisonous snakes and other manifestations. The author is himself a Pentecostal and I noticed a very positive note towards the movement. I think one of the strongest arguments Vinson Synan gives for the movement is the extreme growth it had and has. While, I missed the manipulative tendencies that often appear when doctrine has not the last word, but the pastor or prophets word. The movement also feels a bit like postmodernism, mixing what suits best and a low emphasis on the rational part of life. Still, Pentecostalism brings people to action and the movement has many sincere followers of the Lord Jesus Christ.