Some people refer to the Holy Spirit as the holy ghost. This is an error because the term comes from the Shakespearean times. In that era the people believed in ghosts as indicated by some of the writings of Shakespeare. However, the original Greek is not a ghost but a spirit. God said he is spirit and we must worship him in spirit and truth. Elsewhere in the Bible the Holy Spirit is referred to as a spirit, not a ghost. An additional error occurs i is in the eighth chapter of Romans where the Holy Spirit twice is an it. That is also an error in the translation of the King James translation because the original Greek is a masculine form so that the Holy Spirit is not an it.
In John chapter 16 Jesus said that he would send the comforter and that comforter is the Holy Spirit who will teach about Christ. In John chapter 14:16 Jesus said he would ask the Father to send the comforter to abide with them and that comforter is spirit of truth. In verse 16 Jesus identifies specifically that the comforter is the Holy Spirit to be sent by the Father and teach believers. Therefore, there is a direct relationship between the heavenly Father, the Son, and the Holy Spirit.
There is also a direct correlation between the Holy Spirit that is in believers as indicated in Acts 21:5. In the Old Testament the Spirit of God is referred to as wind or breath in the Hebrew. And it was in Genesis when Adam was created that God breathed the breath of life into the body of Adam and he came alive. All through the Bible in various ways and for various purposes the Holy Spirit has been active among the people of earth. So that the Holy Spirit is a person and not an it. The Holy Spirit is active among men. In that the Holy Spirit confirms the reality of the unseen world of humans gone beyond death of angels and of God himself.
Consider the personality of the Holy Spirit. Believers who are submitted to the Lord and seek him are changed by the Holy Spirit as indicated in Second Corinthians 3:18. It is the Holy Spirit that Helps us grow and become more Christlike even though we will never be perfect. We still strive to please Hm and serve Him by the help of the Holy Spirit. During the day of Pentecost in Acts 2:4 the Holy Spirit gave the disciples the ability to speak in foreign languages. It was through this ability that people came from far and wide of different languages and heard the gospel.
Peter stood up to explain the occurrence to the crowd and said this was an event spoken by the prophet Joel. In that text God says that in the future he will pour out his Spirit on those present at the day of Pentecost. Peter went further to say that those who repent and are baptized shall receive the gift of the Holy Spirit themselves which means each person has the Holy Spirit abiding within at the point of salvation. It is interesting to note in John 14:16 that the Trinity of the Godhead is all mentioned being the Father, the Son, and the Holy Spirit.
So then remember that the Holy Spirit has come to all believers and will speak of truth and will guide and will comfort. Think of the Holy Spirit is a person and not an it or a phantom. We as believers can be strong in the Lord because the Holy Spirit abides with us.