The Holy Trinity has been Christian doctrine since the Fourth Century, AD. Christians believe there is one God, and in the unity of that one God there are three distinct, equal, and divine persons: God the Father, God the Son, and God the Holy Spirit. Each has his own ministry (job, role). Please refer to Deuteronomy 6:4-7, Matthew 28:19, 2Corinthians 14:14, 1Peter 1:2, 1Corinthians 12:4-6, and Ephesians 4:4-6.
The ministry of the Holy Spirit has many aspects. For example, He dwells in us and helps us by teaching us, guiding us, and counseling us.
“If you love me, you will keep my commandments. 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.
“I will not leave you as orphans; I will come to you. Yet a little while and the world will see me no more, but you will see me. Because I live, you also will live. In that day you will know that I am in my Father, and you in me, and I in you. Whoever has my commandments and keeps them, he it is who loves me. And he who loves me will be loved by my Father, and I will love him and manifest myself to him.” Judas (not Iscariot) said to him, “Lord, how is it that you will manifest yourself to us, and not to the world?” Jesus answered him, “If anyone loves me, he will keep my word, and my Father will love him, and we will come to him and make our home with him. Whoever does not love me does not keep my words. And the word that you hear is not mine but the Father’s who sent me.
“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 14:15-26 ESV)
Now we have received not the spirit of the world, but the Spirit who is from God, that we might understand the things freely given us by God. And we impart this in words not taught by human wisdom but taught by the Spirit, interpreting spiritual truths to those who are spiritual. (1Corinthians 2:12-13 ESV)
“I tell you, my friends, do not fear those who kill the body,
and after that have nothing more that they can do. But I will warn you
whom to fear: fear him who, after he has killed, has authority to cast into
hell. Yes, I tell you, fear him! Are not five sparrows sold for two
pennies? And not one of them is forgotten before God. Why, even the
hairs of your head are all numbered. Fear not; you are of more value than many
sparrows.
“And I tell you, everyone who acknowledges me before men, the
Son of Man also will acknowledge before the angels of God, but the one who
denies me before men will be denied before the angels of God. And
everyone who speaks a word against the Son of Man will be forgiven, but the one
who blasphemes against the Holy Spirit will not be forgiven. And when
they bring you before the synagogues and the rulers and the authorities, do not
be anxious about how you should defend yourself or what you should
say, for the Holy Spirit will teach you in that very hour what you ought
to say.” (Luke 12:4-12 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. All that the Father has is mine; therefore I said that he will take what is mine and declare it to you. (John 16:13-15 ESV)
I do not cease to give thanks for you, remembering you in my prayers, that the God of our Lord Jesus Christ, the Father of glory, may give you the Spirit of wisdom and of revelation in the knowledge of him, having the eyes of your hearts enlightened, that you may know what is the hope to which he has called you, what are the riches of his glorious inheritance in the saints, and what is the immeasurable greatness of his power toward us who believe, according to the working of his great might that he worked in Christ when he raised him from the dead and seated him at his right hand in the heavenly places, far above all rule and authority and power and dominion, and above every name that is named, not only in this age but also in the one to come. (Ephesians 1:16-21 ESV)
When we read the Holy
Bible, we should pray for the leading of the Holy Spirit so that we understand
it correctly and can apply it to our lives. If we read the Bible daily, or at least
regularly, when we face problems or need to make decisions, and pray for divine
direction, our Counselor, the Holy Spirit, will help us bring to mind the
scriptures that apply. (John 14:26) We
should obey the counsel of the Holy Spirit in order to live to please God,
rather than our old sinful human nature. (Romans 8:5-11)
Acknowledgement: All Bible verses quoted were copied from, https://biblehub.com/