The Holy Spirit is the third person of the Trinity, poured out by the exalted Christ at Pentecost to empower the church's witness, guide believers into truth, and apply the finished work of Christ.
The Spirit does not draw attention to Himself but glorifies Christ. At Pentecost, the Spirit was poured out as the promised gift of the risen and enthroned Christ.
See in Scripture: John 14:26; Acts 1:8; Acts 2:33