Glossolalia, or “speaking in tongues,” has long constituted a prominent feature of global Pentecostalism. Similar phenomenon occur in a number of ancient and modern non-Christian religions (e.g., Oracle of Delphi, African indigenous religions, Mormons), though the degree of commonality is debated. In Pentecostal and Charismatic circles, the experience usually signifies the “baptism in the Holy Spirit”—understood variously as a second or third work of grace subsequent to conversion. For some within the classical Pentecostal tradition, including (but not limited to) the Assemb…