Holy Spirit. For the majority of Christian denominations, the Holy Spirit, or Holy Ghost, is the third person of the Trinity: the Triune God manifested as God the Father, God the Son, and God the Holy Spirit; each entity itself being God.
   Nontrinitarian Christians, who reject the doctrine of the Trinity, differ significantly from mainstream Christianity in their beliefs about the Holy Spirit. In Christian theology, pneumatology refers to the study of the Holy Spirit.
   Due to Christianity's historical relationship with Judaism, theologians often identify the Holy Spirit with the concept of the Ruach Hakodesh in Jewish scripture, in the belief Jesus was expanding upon these Jewish concepts. Similar names, and ideas, include the Ruach Elohim, Ruach YHWH, and the Ruach Hakmah.
   In the New Testament it is identified with the Spirit of Christ, the Spirit of Truth, the Paraclete and the Holy Spirit. The New Testament details a close relationship between the Holy Spirit and Jesus during his earthly life and ministry.
   The Gospels of Matthew and Luke and the Nicene Creed state that Jesus was conceived by the Holy Spirit, born of the Virgin Mary. The Holy Spirit descended on Jesus like a dove during his baptism, and in his Farewell Discourse after the Last Supper Jesus promised to send the Holy Spirit to his disciples after his departure. The Holy Spirit is referred to as the Lord, the Giver of Life in
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