Speaking in tongues or glossolalia, is a spiritual practice common across the Pentecostal and Charismatic streams of global Christianity. This volume unusually seeks to shed constructive light on this fascinating spiritual phenomenon by looking at it from perspectives of various academic disciplines. The volume considers the perspectives of New Testament studies, history, social sciences, psychology, linguistics, philosophy, as well as theology. This variety of perspectives contributes to a richer understanding of the gift of tongues. The concluding chapter seeks to show how theology functions as the coordinating discipline around and in relation to which these other disciplinary perspectives engage.