Holy Spirit

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The Holy Spirit depicted as a dove above child Jesus, painting by Juan Simon Gutierrez

In Christianity, the Holy Spirit is the Spirit of God. In mainstream (Trinitarian) Christian beliefs he is the third person of the Trinity. As part of the Godhead, the Holy Spirit is equal with God the Father and with God the Son.
The Christian theology of the Holy Spirit was the last piece of Trinitarian theology to be fully developed. There is also greater diversity in Christian theology of the Spirit (pneumatology) than there is in the theology of the Son (Christology) or of the Father.