What is the Holy Spirit?

The Holy Spirit is the essence of God. The Holy Spirit is the power and the mind of God. (Genesis 1:2-3) (Jeremiah 51:15) The Holy spirit is the comforter and helper promised by Jesus Christ, poured out by God on the Day of Pentecost  A.D. 31.

The Holy Spirit is "God" -being the very essence of both the Father and the Son.

The Holy Spirit is primarily imparted to man by the laying on of hands after repentance and baptism. (Acts 8:18 / 2:38)

The Holy spirit is the source of inspiration and prophecy throughout the Scriptures and is the Christian's constant guide to all truth and understanding. (Acts 2:17) (John 16:13)

The Holy Spirit is the spirit of truth. (John 14:16-17)

The Holy Spirit is what makes us one with God the Father and Jesus the Son. (John 17:21)

In Romans 8, Paul identifies those who have the indwelling of the Holy Spirit as the Children of God and heirs of the Kingdom of God. 

The Holy Spirit produces the wonderful fruits named in Galatians 5 in the person possessing its indwelling.

God gives gifts such as the ability to prophesy, heal, speak in other tongues, ,both earthly and heavenly, interpretation of tongues, miracles, administration, discernment of spirits, wisdom, knowledge, faith, etc. through the working of the Holy Spirit. (1 Corinthians 12)

God gives gifts to His Church for the purpose of administration regarding the Assembly through the working of the holy spirit also. The gifts of Apostle, Prophet, Evangelist, Pastor, Teacher and Deacon are all bestowed by God through the power of the Holy Spirit. (Acts 20:28) (Ephesians 4:8-16)