Fifty days after the resurrection of Jesus, God began His Church with an event that has caused controversy ever since. It was on the Day of Pentecost that the disciples were filled with the Holy Spirit and began to speak with other tongues and magnify God. This day marked the end of Jesus' earthly ministry and the start of the ministry of the Holy Spirit. This book is a verse-by-verse argument in defense of I Corinthians chapter 14. The Apostles were willing to stand for it in Jerusalem and so should we to the uttermost parts of the world.