In the Gospel of John, Jesus talks about the Holy Spirit this way:
But the Comforter, the Holy Spirit whom the Father will send in my name, will teach you all things and remind you of the things that I have said to you. In this verse we see the work of the Holy Trinity - the Holy Spirit is sent by the Father in the name of the Son for the redeemed people of God. (John 14:26)
In another part of John's Gospel, Jesus talks about the Holy Spirit as "but when the Spirit of truth comes, he will guide you in all truth. (John 16:13) The church has claimed for the two millennia that the Holy Spirit is the one that has been given to guide the Church. When the Church submits to the Holy Spirit who is God, the church is walking in the truth.
In the first chapter of Acts that records the last speech of Jesus Christ before he returned to his heavenly glory with the Father, Jesus speaks to His disciples: Do not leave Jerusalem, but wait for the gift my Father promised... For John baptized with water but in a few days you will be baptized with the Holy Spirit. (Acts 1:4-5) As the Apostles waited for the Holy Spirit until the Day of Pentecost when the Holy Spirit descended on them, so it imperative of every Christian who wants to do the work of God to wait until he or she is empowered by the Holy Spirit for the work that God has called them to do.
Apostle Paul talks extensively about the Holy Spirit, especially in his Epistle to Romans. In Romans 1:4 he writes: Jesus Christ, who through the Spirit of holiness was declared with power to be the Son of God by his resurrection from the dead; Jesus Christ our Lord. This continues what we know about the participation of the Holy Spirit in the ministry and the life of Jesus Christ - conceived by the Holy Spirit, endowed by the Holy Spirit at his baptism, lead by the Holy Spirit to be tempted in the wilderness and now we see the participation of the Holy Spirit in the resurrection of Jesus Christ.
However, it is in the 8th chapter of Romans that Paul talks extensively about the Holy Spirit. He starts in 8:2 by writing; Therefore, there is now no condemnation for those who are in Christ Jesus because through Christ Jesus the law of the Spirit of life set me freed from the law of sin and death. (Romans 8:1-2) Paul had just finished his main argument in the 7th chapter and uses one of those words that concludes and begins a new idea. "Therefore" concludes what could happen to those who are without Christ and still in bondage and therefore, will experience death.
It is in Romans 8:9 that Paul talks about the Holy Trinity and how the Holy Trinity functions in the believer. You, however, are controlled not by the sinful nature but by the Spirit, if the Spirit of God lives in you. And if anyone does not have the Spirit of Christ, he does not belong to Christ. (Romans 8:9) The identity of the believer with Jesus is done by the Holy Spirit, who was sent by the Father in the name of the Son, and therefore, properly could be said that it is the Spirit of the Father and of the Son.
This presence of the Holy Spirit introduces another name. "For you did not receive a spirit that makes you slave to fear, but you have received the Spirit of sonship. And by him we cry "Abba, Father." This Spirit testifies with our spirit that we are God's children. (Romans 8:15-16) This passage here has been of such a comfort to the children of God because the Holy Spirit united His testimony with our spirits as human beings in declaring that we are the sons and daughters of God. In fact, without the presence of the Holy Spirit in us we cannot make that claim.
In 2 Corinthians the Holy Spirit is called the Spirit of faith, while in Ephesians 1:17 is the called the Spirit of wisdom and revelation. The author of the book of Hebrews calls the Holy Spirit the eternal Spirit, establishing the truth that God the Father, God the Son and God the Holy Spirit are eternal. The Holy Trinity is without beginning and without end.
We shall conclude this article by the testimony of one who has received the Holy Spirit and who was transformed by the Holy Spirit, namely Peter. He calls the Holy Spirit the Spirit of glory because it is the Holy Spirit who is in us who will transform us to be able to withstand the glory of the everlasting life in the presence of the Almighty God.
In our days there is a lot of conversation about spirituality. Yet spirituality without the Holy Spirit sent to us by God is idolatrous. It is good for people in our days to make sure that they are lead by the Spirit of God, and not by other spirits that Satan has launched in this world. The way you verify this is to ask yourselves if the spirit that leads you provides the qualities that the Holy Spirit of God provides.