Is Holy Spirit a Person? Yes, He is.
"But the Advocate, the Holy Spirit, whom the Father will send in my name,
will teach you all things and will remind you of everything I have said to you."
Holy Spirit is the third person of Trinity. Holy Spirit is fully God with their own emotions, mind, and will. When a person becomes a Christian the Holy Spirit comes into that person’s life and takes permanent residence in that person.
“… if anyone does not have the Spirit of Christ, they do not belong to Christ” (Romans 8:9; Ephesians 1:14).
Bible says that a person who has not received the Spirit does not belong to Christ which means that person is not received redemption; the person is without a guarantee that belongs to Him.
“Now it is God who makes both us and you stand firm in Christ. He anointed us, set His seal of ownership on us, and put His Spirit in our hearts as a deposit, guaranteeing what is to come." (2 Corinthians 1:21-22; Ephesians 1:13).
When a new believer begins his or her new life (2 Corinthians 5:17) the Spirit comes and testifies that he or she is a child of God (Romans 8:16). All people who obey God and turn to Him receive this precious gift – Holy Spirit (Acts 5:32).
Jesus promised: “when He, the Spirit of truth, comes, He will guide you into all the truth. He will not speak on His own; He will speak only what He hears, and He will tell you what is yet to come” (John 16:13). For that reason it is so important to read Bible daily may new believers can grow and mature in the knowledge of God.
For that reason, it is so important to attend local church meetings and be together with other believers. And as a new believer begins to read and study the Word of God, spend time with God in prayer, and communicate with other believers, a person also learns to recognize the leading of Spirit.
Although the Spirit of God lives in the person permanently, nonetheless, He can be grieved and quenched. (Ephesians 4:30; 1 Thessalonians 5:19; Isaiah 63:10; Psalm 78:40).
Here comes the most important thing of all – prayer and communication with God.
Going even one day without prayer and Bible reading believer can be cast back into old life and left without any guidance, support, help, and direction from Him, the Holy Spirit. And only through prayer to Father through Jesus Christ believer is able to restore his relationship with Him, Holy Spirit.
As time goes by and the believer grows and matures in her or his faith, the Spirit starts to produce more and more fruit in the Christian’s life. (Galatians 5:22-23).
When new believers allow Spirit to take over and submit their lives fully under His control, Spirit empowers them to live as Christ has commanded to live.
No person can live with an old mind and still be called a child of God. No person can live according to the world, flesh and follow Satan’s devices, and still be called the child of God. Therefore Paul teaches us:
“Do not conform to the pattern of this world, but be transformed by the renewing of your mind…” and “put on the new self, which is being renewed in knowledge in the image of its Creator.” (Romans 12:2; Colossians 3:10; Ephesians 4:23-24).
Spirit has many functions and all of them He is doing according to God the Father and Lord Jesus Christ. He is Spirit of God which means Spirit of Truth. God is Truth. (John 14:6) and in Him, we live.
The Holy Spirit joins us (our spirit) to God. Without God, without His Spirit within us, we are dead in our transgressions and sins. (Ephesians 2:1-2). The Holy Spirit reveals to us everything about Jesus, makes us alive in Him and empowers us to do the will of God (John 14:26; 1 John 2:27; Romans 8:10-11; Ephesians 3:16).
“For if you live according to the flesh, you will die; but if by the Spirit you put to death the misdeeds of the body, you will live. Those who are led by the Spirit of God are the children of God.
The Spirit you received does not make you slaves so that you live in fear again; rather, the Spirit you received brought about your adoption to sonship. And by him, we cry, “Abba, Father.” (Romans 8:13-15). You are not any longer under law! (Galatians 5:18).
"Do you not know that your bodies are temples of the Holy Spirit,
who is in you, whom you have received from God? You are not your own?"
(1 Corinthians 6:19).