In
Christianity, Trinity is the
doctrine that
God is
one being who exists, simultaneously and
eternally, as a
mutual indwelling of three
persons (not to be confused by "person"): the
Father, the Son (incarnate as
Jesus of Nazareth), and the
Holy Spirit. Since the 4th century, in both Eastern and Western Christianity, this doctrine has been stated as "three persons in one God," all three of whom, as distinct and co-eternal persons, are of one indivisible Divine
essence, a
simple being. The doctrine also teaches that the Son Himself has two distinct natures, one fully divine and the other fully human. Supporting the doctrine of the Trinity is known as Trinitarianism. The majority of Christians are Trinitarian, and regard belief in the Trinity as a test of Christian
orthodoxy.
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