Regarding the personality and deity of the Holy Spirit, it’s important to understand what the Trinity doctrine does and doesn’t say, because the WTS often misrepresents it.
A basic statement of the Trinity doctrine is that within the nature of the one true God there are three distinct persons -- Father, Son, and Holy Spirit. "Distinct" means that the Father is not the Son. The Son is not the Holy Spirit. The Holy Spirit is not the Father.
The NWT translates 2 Corinthians 3:17-18 as follows: "Now Jehovah is the Spirit; and where the Spirit of Jehovah is, there is freedom. And all of us, while we was unveiled faces reflect like mirrors the glory of Jehovah, are transformed into the same image from glory to glory, exactly as done by Jehovah [the] Spirit."
This tells us that Jehovah is the Spirit. How is it, then, that Jehovah = Spirit = person = God, but somehow the Holy Spirit = spirit = impersonal force?
Let's see what specific Scriptures tell us about the Holy Spirit.
In Acts 5, a man named Ananias lied to the apostles about how much of his property he was donating to the church. Acts 5:3-4 says this: "Then Peter said, "Ananias, how is it that Satan has so filled your heart that you have lied to the Holy Spirit and have kept for yourself some of the money you received for the land? 4 Didn't it belong to you before it was sold? And after it was sold, wasn't the money at your disposal? What made you think of doing such a thing? You have not lied to men but to God."
Notice that in verse 3, Peter says that Ananias lied to the Holy Spirit. You cannot lie to an impersonal force like electricity. You can only lie to a person. Therefore, the Holy Spirit is a person, and verse 4 says, "You have not lied to men but to God." The Holy Spirit can be lied to, and the Holy Spirit is specifically called God.
Regarding spiritual gifts, 1 Corinthians 12:11 says, "All these are the work of one and the same Spirit, and he gives them to each one, just as he determines." Notice here that it is the Holy Spirit that determines which person gets which spiritual gifts. The Holy Spirit therefore has a mind and a will; He is not an impersonal force.
Acts 13:2, 4: "While they were worshiping the Lord and fasting, the Holy Spirit said, "Set apart for me Barnabas and Saul for the work to which I have called them…4 The two of them, sent on their way by the Holy Spirit, went down to Seleucia and sailed from there to Cyprus."
Notice that it was the Holy Spirit who decided what ministry Barnabas and Saul would have and called them to it. The Holy Spirit even spoke to the apostles using the personal pronoun "I." It was also the Holy Spirit who sent them on their way.
Acts 10:19-20: "9 Meanwhile, as Peter was puzzling over the vision, the Holy Spirit said to him, "Three men have come looking for you. 20 Go down and go with them without hesitation. All is well, for I have sent them."
Romans 8:26-27 says: "In the same way, the Spirit helps us in our weakness. We do not know what we ought to pray for, but the Spirit himself intercedes for us with groans that words cannot express. 27 And he who searches our hearts knows the mind of the Spirit, because the Spirit intercedes for the saints in accordance with God's will."
Notice from this passage that the Holy Spirit intercedes with the Father on our behalf. Intercession can only be done by a person. The Holy Spirit groans, indicating that He has emotions. In verse 27, we are told that the Holy Spirit has a mind, that He intercedes for the saints, and that He understands God's will.
1 Corinthians 2:10-11 says: "…but God has revealed it to us by his Spirit. The Spirit searches all things, even the deep things of God. 11 For who among men knows the thoughts of a man except the man's spirit within him? In the same way no
one knows the thoughts of God except the Spirit of God."
Notice that God reveals truths by his Spirit. The Spirit is able to search the deep things of God. The Spirit knows the thoughts of God. The Holy Spirit, therefore, is not an impersonal force. The Holy Spirit must be God, because who can understand all of God's thoughts except God Himself?
In John 14:26, Jesus said: "But the Counselor, 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."
Notice that the Holy Spirit is a counselor and a teacher. This also indicates that the Holy Spirit is a person.
In Acts 15:28, the apostles wrote: "It seemed good to the Holy Spirit and to us not to burden you with anything beyond the following requirements…" Only a person can decide what requirements to impose on a group of people.
Isaiah 63:10: "Yet they rebelled and grieved his Holy Spirit. So he turned and became their enemy and he himself fought against them." Here, the Holy Spirit can be rebelled against and experience grief. These are characteristics of personality.
Ephesians 4:30: "And do not grieve the Holy Spirit of God, with whom you were sealed for the day of redemption." Again, the Holy Spirit can experience grief. This is any motion that can only be experienced by a person.
The Holy Spirit is God, not an impersonal force. John 4:24: "God is spirit, and his worshipers must worship in spirit and in truth."
The Father, Son and Holy Spirit all share one name in which we are to be baptized. Matthew 28:19: "Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit…"
The Watchtower says that since many people can be simultaneously filled with the Holy Spirit (Acts 4:31), the Holy Spirit cannot be a person. However, Colossians 1:19 says of Christ: "For God was pleased to have all his fullness dwell in him…" Here, it is the fullness of God Himself that dwelt in Jesus. And in Ephesians 3:19, Paul prays that his readers might "… may be filled to the measure of all the fullness of God." These verses show that it is quite possible for many people to be filled with the fullness of God Himself. Clearly, does not mean that God is an impersonal force.
I think these passages demonstrate that the Holy Spirit is both a person and God Himself.