The baptism of the Holy Spirit is an infilling of power that Jesus performs in the life of one who is completely yielded to Him. It is not a requirement for salvation; rather, it is a gift for those who have already received the new birth.
The person of the Holy Spirit is not known to many Christians. The Holy Spirit is a significant person in Christianity and Christian living. The knowledge of who the Holy Spirit is has been established that people do not argue His personality.