The Holy Spirit is not a mystical power or ethereal force. He is a person as much as Jesus is a person. He is not a floating fog or some kind of ghost-like emanation. It is unfortunate that the King James translators used the term “ghost” instead of “spirit” to translate the Greek pneuma. For generations, people have had the erroneous idea that the Holy Spirit is something like the comic-book character Casper the Friendly Ghost. He is, however, not a ghost, but a person.
All believers have two Paracletes – the Spirit of God, within us, and Christ, at the right hand of the Father in heaven. First John 2.1 says, “My little children, I am writing these things to you so that you may not sin. But, if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous.” The word translated “advocate” in that verse is parakletos.
From: The Upper Room: Jesus’ Parting Promises for Troubled Hearts by John MacArthur (n.p.: Kress Biblical Resources, 2014), pp. 103-104.