What does the Holy Spirit do? from Compelling Truth
The Holy Spirit is one of the three persons of the Trinity, along with the Father and the Son (Jesus Christ). The Holy Spirit is a person, interacts with us personally, and is in relationship with both the Father (Genesis 1:2; Exodus 31:3) and the Son (Romans 8:9). The Holy Spirit interacts with us in His own way—distinct from the Father and the Son: “The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all” (2 Corinthians 13:14). Each of the persons of the Trinity is God. The persons of the Trinity are distinctly separate and yet function together as one; we have only one God, consisting of three persons.
One of the main roles of the Holy Spirit is as a helper and comforter to believers. He helps us and teaches us (John 14:26), and assists us in prayer (Romans 8:26–27; Jude 1:20). He comforts us and gives us joy in the midst of affliction. He has fellowship with us (1 Thessalonians 1:6; 2 Corinthians 13:14) and fills us so that we become more like Christ (Ephesians 5:18). The Holy Spirit intercedes for us when we are weak. When we don’t know how to pray, the Spirit prays for us, “with groanings too deep for words” (Romans 8:26–27) according to God’s knowledge and will. He gives us hope, joy, and peace (Romans 15:13).
Another role of the Holy Spirit involves salvation. God saves us by His mercy, and does it “by the washing of regeneration and renewal of the Holy Spirit” (Titus 3:5). The Holy Spirit “seals” us (Ephesians 1:13; 4:30). This means that God gives us fellowship with the Spirit as a way of promising that we belong to Him. Another indication that we belong to God is the Spirit’s work in us, as He fills us (Ephesians 5:18), gives us gifts (1 Corinthians 12:4–11), and bears good fruit—His own fruit—through us (Galatians 5:19–26). He also leads us into righteousness, walking by our side (Galatians 5:16–18). He is intimately involved in our salvation and growth as believers. We are actually “born of the Spirit” and Jesus said that when something is born of Spirit, it is also spirit (John 3:5–8). So, we get our spiritual life from the Holy Spirit; we are His children in a very real sense!