‘Glossolalia, healing, prosperity, and spiritual warfare’ illustrates how Pentecostalism's openness to religious experience has facilitated its malleability. The criterion of speaking with tongues, or glossolalia, reduced the range of revivalistic phenomena that congregations or preachers were looking for in their quest for spiritual power or holiness. This doctrinal precision gave order to the revivalistic fringes of Methodism and its holiness offshoots. Pentecostals are mostly engaged with the ordinary struggles of life — health, money, and how to live and to understand what is going on in the world. Healing, prosperity, exorcism, and spiritual warfare are discussed, along with details of Smith Wigglesworth, a preacher who became known as the ‘apostle of faith’.