Trinity, in Christian doctrine, the unity of Father, Son, and Holy Spirit as three persons in one Godhead. The doctrine of the Trinity is considered to be one of the central Christian affirmations about God. It is rooted in the fact that God came to meet Christians in a threefold figure: (1) as Creator, Lord of the history of salvation, Father, and Judge, as revealed in the Old Testament; (2) as the Lord who, in the incarnated figure of Jesus Christ, lived among human beings and was present in their midst as the “Resurrected One”; and (3) as the Holy Spirit, whom they experienced as the helper or intercessor in the power of the new life.
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