The Holy Spirit is the third person of the Trinity and God. He comes to live inside Christians to help them do God's work. In the Old Testament, some people received the Holy Spirit to fulfill tasks from God. Jesus promised the Holy Spirit would come after him. In the New Testament, the disciples received the Holy Spirit and were given new abilities. Now all Christians have access to the Holy Spirit. He helps people become children of God, know God better through Christ, and develop Godly character traits through spending time with Him. The Holy Spirit also gives spiritual gifts to Christians and empowers them to spread the gospel message.