After working with Parham for a short time in Texas, Seymor moved on to Los Angeles, California where he established the beginning foundation of the movement. It was through Holiness churches that Pentecostalism spread and developed it's leaders. The significant difference between the Holiness movement and Pentecostal movement was the insistence on Glossolalia as the necessary evidence of a person's spirit baptism. Being baptized in the Holy Spirit or the ability to speak in tongues was familiar to both groups, but it was the standard for Pentecostalism. Tongues is viewed as a sign of the movement's main emphasis in God's plan.
Pentecostals believe they are called to achieve two principles.
The first is that they are the announcers to Christ's Second Coming. Though intention may have been sincere regarding the freedom of theological expression, conflict arouse concerning doctrinal irregularity. Clashes over interpretation of scripture caused groups to divide. Parham considered Seymours church undisciplined, whereas Seymour saw Parham as simply jealous. Two other areas that have caused division within the body of the Pentecostal movement are the doctrine of sanctification and the doctrine of the Trinity.