They were "filled," or baptized, with the Spirit. The Holy Spirit invaded every part of their being–their minds, wills, emotions, and physical bodies. This baptism resulted in the speaking of other tongues. These frightened, self-centered, discouraged people were transformed by being infused with the Holy Spirit. This first group of Pentecostal believers had a powerful experience with the almighty God, because Pentecostal's are experience oriented!