 These Pentecostals believe that in the baptism in the Holy Spirit, the power of the Spirit is released in their lives.Many Pentecostals believe that the normative initial evidence of this infilling (baptism) of the Holy Spirit is the ability to speak in other tongues (glossolalia),
and that tongues are one of several spiritual manifestations of the presence of the Holy Spirit in an individual believer's life.Non-trinitarian views about the Holy Spirit differ significantly from mainstream Christian doctrine and generally fall into several distinct categories.