All Bible students are fully aware of the third entity in the triune Godhead. We know that there are three because we are told that...the Father, the Son and the Holy Spirit. Awareness is not equal to understanding it however. Perhaps we will never understand completely just how these three personalities combined represent the Godhead until we face them in eternity. Roughly, it appears that the Father is the ultimate ruler of the universe. The Son is that entity, although in existence prior to his appearance on earth as Jesus Christ, that not only held a highly exalted position in heaven prior to coming here to give his life for sinners. And the Holy Spirit is known only for certain actions. All of these three entities, combine to be one God. This again is difficult to perceive. Let us concentrate on this third portion of the Godhead and examine those scriptures related to him.
First, he is definitely an individual personality. Read Paul's explanation of some of his work.
Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered. And he that searcheth the hearts knoweth what is the mind of the Spirit, because he maketh intercession for the saints according to the will of God. (Romans 8:26-27 KJV)
The Spirit is regularly referred to as 'he'. This is not surprising and neither does it mean he is male. Spirits, including God, Jesus and the Holy Spirit are gender neutral. In heaven, or anywhere else in the hereafter, there are no different genders. Gender is entirely discerned by the physical makeup of male and female in the physical realm, and exists for purposes of procreation, in plants and animals. Although some species, especially are asexual. There are no births in the spiritual realm since there are no deaths either. Reproduction is not a part of the spirit realm.
Since the Spirit has a mind, he can think and has knowledge. In fact since they are all one, all have unlimited knowledge and wisdom.
But God hath revealed them unto us by his Spirit: for the Spirit searcheth all things, yea, the deep things of God. For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God. (1 Corinthians 2:10-11 KJV)
We know that the Spirit was in the beginning and that he took part in the creation process.
And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters. (Genesis 1:2 KJV)
Jesus mentioned the Holy Spirit to his apostles on several occasions, referring to him as 'the Comforter' and told of his purpose for coming to them after Jesus' ascension.
Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you. And when he is come, he will reprove the world of sin, and of righteousness, and of judgment: (John 16:7-11 KJV)
Now in the following quote from Jesus, he implies that the Spirit will embed the truths of Jesus' teaching into the apostles hearts. Read it carefully
Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come. He shall glorify me: for he shall receive of mine, and shall shew it unto you. All things that the Father hath are mine: therefore said I, that he shall take of mine, and shall shew it unto you. (John 16:13-15 KJV)
We also know that the Spirit indwell within humans and direct their thoughts. After Jesus had told the apostles on several occasions of the coming of the comforter to them after his ascension, and then asked them to into Jerusalem and wait for to be endued power and the coming of the kingdom. We encourage all readers to visit and read the 2nd chapter of Acts which describes the coming of this spirit and setting upon each of them. Then they were given the ability to speak in all the languages which were present at that gathering. Peter's sermon is recorded in full for us, under the direction of the Holy Spirit in this second chapter.
There are several notable things to be remembered in the above chapter. First, included in Peter's sermon, he assured those who had believed that they could have ther sins forgiven and also receive a gift of the Holy Spirit. Those newly baptized persons, during the life of the apostles, were endowed with a spiritual gift from the Holy Spirit, by having an apostle lay their hands on them. Only those apostles who had received the Holy Spirit and had him indwelling within them, could pass a gift on to others. Secondly, we see the Lord's church begin with power, in that some 3,000 were baptized into Christ that first day and 'The Lord added to the church daily, such as should be saved'.
The Holy Spirit also had the power to direct the sentiments of the apostles in which he dwelt. Please read these verses carefully.
And not only so, but we glory in tribulations also: knowing that tribulation worketh patience; And patience, experience; and experience, hope: And hope maketh not ashamed; because the love of God is shed abroad in our hearts by the Holy Ghost which is given unto us. (Romans 5:3-5 KJV)
And finally, the Holy Spirit had the power to direct the apostles, to order them not to do certain things and then to do other things:
Now when they had gone throughout Phrygia and the region of Galatia, and were forbidden of the Holy Ghost to preach the word in Asia, (Acts 16:6 KJV)
All in all, it appears that the primary duties of the Holy Spirit, at least especially during the founding of the Lord's church, was th at of assuring that the truths of Jesus Christ were maintained and presented to others, in the early beginning of the church, and to see that all of these things were recorded in a manner that would make it available for as long as the world stands. And indeed it has, and has increased in popularity from it's beginning. May God's will be done on earth as it is in heaven.