Serving as the "catalyst" of the Pentecostal movement in the twentieth century, William J. Seymour turned a tiny former horse stable in Los Angeles into an international center of revival. Baptism of the Holy Spirit, with the evidence of speaking in tongues, was a major part of the meetings held there, and Seymour led the first organized movement that promoted this experience. At Azusa, blacks, whites, Hispanics, and Europeans all met and worshiped...