The Holy Spirit is the third person of the trinity, eternally existent, equal in authority and power as the Father and the Son. The Holy Spirit was active in the Creation of the universe. Now He dwells within the life of every follower of Christ and serves as the seal of our salvation. The Holy Spirit convicts the world of sin, righteousness & judgment. Likewise, He works to conform the believer into the image of Christ by convicting the believer of sin, guide the believer in daily life, comfort the believer in difficulty/sorrow and equips the believer with gifts so that the believer might work to advance the Kingdom.
(Matthew 28:19, Genesis 1:1, Deuteronomy 6:4, Genesis 1:2, Acts 2:1-4, Romans 8:9-11, John 14, 16-17, Ephesians 1:13, John 16:8, John 16:13-14, John 14:26, Isaiah 61:1-3, Matthew 28:18-20)