During the 20th century, glossolalia primarily became associated with Pentecostalism and the later charismatic movement. Preachers in the Holiness Movement preachers Charles Parham and William Seymour are credited as co-founders of the movement. Parham and Seymour taught that "baptism of the Holy Spirit was not the blessing of sanctification but rather a third work of grace that was accompanied by the experience of tongues".[1] It was Parham who formulated the doctrine of "initial evidence".