The Purpose, Work & Ministry of the Holy Spirit in the Life of a Believer.
And I will ask the Father, and he will give you another Helper, to be with you forever, even the Spirit of truth, whom the world cannot receive, because it neither sees him nor knows him. You know him, for he dwells with you and will be in you.                                                              John 14:16‭-‬17 ESV
“These things I have spoken to you while I am still with you. But the Helper, the Holy Spirit, whom the Father will send in my name, he will teach you all things and bring to your remembrance all that I have said to you.                                                                                                John 14:25‭-‬26 ESV ‬
When the Spirit of truth comes, he will guide you into all the truth, for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come. He will glorify me, for he will take what is mine and declare it to you.       John 16:13‭-‬14 ESV ‬
And hope does not put us to shame, because God’s love has been poured into our hearts through the Holy Spirit who has been given to us.                                                                        Romans 5:5
So then, brothers, we are debtors, not to the flesh, to live according to the flesh. For if you live according to the flesh you will die, but if by the Spirit you put to death the deeds of the body, you will live. For all who are led by the Spirit of God are sons of God. For you did not receive the spirit of slavery to fall back into fear, but you have received the Spirit of adoption as sons, by whom we cry, “Abba! Father!” The Spirit himself bears witness with our spirit that we are children of God, and if children, then heirs—heirs of God and fellow heirs with Christ, provided we suffer with him in order that we may also be glorified with him.                                                            Romans 8:13-17
Likewise the Spirit helps us in our weakness. For we do not know what to pray for as we ought, but the Spirit himself intercedes for us with groanings too deep for words. And he who searches hearts knows what is the mind of the Spirit, because the Spirit intercedes for the saints according to the will of God.                                                                                                                Romans 8:26&27
And John bore witness: “I saw the Spirit descend from heaven like a dove, and it remained on him. I myself did not know him, but he who sent me to baptize with water said to me, ‘He on whom you see the Spirit descend and remain, this is he who baptizes with the Holy Spirit.’ John 1:32‭-‬33 ESV
Jesus answered, “Truly, truly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God. That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.                                                                                                                      John 3:5‭-‬6 ‬
He whom God has sent utters the words of God, for he gives the Spirit without measure. John 3:34
Then Jesus was led up by the Spirit into the wilderness to be tempted by the devil.      Matthew 4:1 
Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit,                                                                                   Matthew 28:19 ESV
And when they bring you to trial and deliver you over, do not be anxious beforehand what you are to say, but say whatever is given you in that hour, for it is not you who speak, but the Holy Spirit.
                                                                                                                                    Mark 13:11 ESV
​For the Holy Spirit will teach you in that very hour what you ought to say.”                       Luke 12:12 
If you then, who are evil, know how to give good gifts to your children, how much more will the heavenly Father give the Holy Spirit to those who ask him!”                                      Luke 11:13 ESV
On the last day of the feast, the great day, Jesus stood up and cried out, “If anyone thirsts, let him come to me and drink. Whoever believes in me, as the Scripture has said, ‘Out of his heart will flow rivers of living water.’” Now this he said about the Spirit, whom those who believed in him were to receive, for as yet the Spirit had not been given, because Jesus was not yet glorified. John 7:37‭-‬39
Jesus breathed on them and said to them, “Receive the Holy Spirit.                         John 20:22 ESV
how shall we escape if we neglect such a great salvation? It was declared at first by the Lord, and it was attested to us by those who heard, while God also bore witness by signs and wonders and various miracles and by gifts of the Holy Spirit distributed according to his will.          Hebrews 2:3&4
he saved us, not because of works done by us in righteousness, but according to his own mercy, by the washing of regeneration and renewal of the Holy Spirit,                                              Titus 3:5
Follow the pattern of the sound words that you have heard from me, in the faith and love that are in Christ Jesus. By the Holy Spirit who dwells within us, guard the good deposit entrusted to you.
                                                                                                                               ​ 2 Timothy 1:13&14
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

The Holy Spirit is;1) in us 2) with us 3) our Leader & Guide 4) our Teacher 5) our Comforter & Helper 6) our Intercessor 7) because of him we have Power from God 8) by the Spirit we put to death the deeds of the body 9) He speaks through us 10) He reveals God’s word to us 11) He gives spiritual gifts
Martin Lloyd-Jones;
in this great plan the Holy Spirit is the applier of salvation. It is His work to bring to us, and to make actual in us, in an experiential manner, that great salvation which we have been considering together and which the Son of God came into the world in order to work out. In the Godhead, the Holy Spirit is the executive, the executor
Now generally speaking, the position today is that the doctrine of the Holy Spirit is either neglected or it tends to be emphasised and exaggerated in a false manner.
Why, then, is He called the Holy Spirit? Surely, the explanation is that it is His special work to produce holiness and order in all that He does in the application of Christ’s work of salvation. he produces Holiness in us; 
1 Cor 6:11 And such were some of you. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.
2 Cor 3:18 And we all, with unveiled face, beholding the glory of the Lord, are being transformed into the same image from one degree of glory to another. For this comes from the Lord who is the Spirit.
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Saint Augustine of Hippo; A Prayer;
O Holy Spirit, descend plentifully into my heart. Enlighten the dark corners of this neglected dwelling and scatter there Thy cheerful beams.