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Trinity
From A Storehouse of Knowledge
The Trinity is a term for God, who is eternally existent in three co-equal and co-eternal persons, the Father, Son, and Holy Spirit. The Trinity is expressed in the Bible, in the Nicene Creed, and in the Sign of the Cross.
While generally viewed as a New Testament doctrine, there are a few references in the Old Testament that suggest the Trinity. The best known is in Genesis, when God uses the pronoun "us" to refer to Himself: "Let us make man in our image, in our likeness" (Genesis 1:26).
One of the major New Testament accounts containing the Trinity is the baptism of Christ by John the Baptist, when the Holy Spirit appears as a dove and the voice of God the Father says "Behold, this is My beloved Son, in whom I am well pleased." This is important because it shows all three persons of the Trinity present at the same time.
