The Holy Ghost, also known as God the Holy Spirit, is one of the three persons of the Godhead who make up the single being that is God. As such, He is eternal, omniscient, omnipotent, omnipresent and equal in every way to God the Father and God the Son, as explained in the Bible.
Contrary to what some believe, He is not an impersonal force, but is a real person who shares the attributes of the Father and Son. Like them, He has a will, speaks, grieves, loves and forgives, according to Matt Slick, president and founder of the Christian Apologetics and Research Ministry.
In the Old Testament the Holy Spirit is referred to as the Spirit of the Lord and the Spirit of God. In the New Testament, He is sent to the Earth after Christ’s departure so His disciples would have the universal ministry of the Spirit of Christ in His absence.
In addition to participating in the creation of the universe and advancing God’s plan of salvation, the Holy Spirit indwells all believers and stands ready to fill a number of needs in their lives. Scripture says He assures, leads, empowers, sanctifies, strengthens and teaches. He also guides and helps in weakness.
The Holy Spirit also produces fruit in the lives of believers including love, joy, peace and patience, in addition to kindness, goodness, faithfulness, gentleness and self-control.