For many Christians speaking in tongues is a very common practice. For many others it remains mysterious and controversial. The author spent several years among Christian congregations where speaking in tongues was taught and encouraged as an appropriate expression for worshiping God. Later, as a prison chaplain, he worked with many Pentecostal Christians. His experience is honest and authentic. For the Bible student, or the simply curious, whether one speaks in tongues or not- this study provides focused and solid biblical answers.