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The Holy Trinity in Salvation
With man’s failure to fulfill himself in his created uniqueness, God undertakes the special action of salvation. The Father sends forth His Son (Word) and His Spirit in yet another mission. The Word and the Spirit come to the Old Testament saints to make known the Father. The Word, as it were, incarnates himself in the Law (in Hebrew called the “words”) which is inspired by the Spirit. The Spirit inspires the prophets to proclaim the Word of God. Thus, the Law and the Prophets are revelations of God in His Word and His Spirit. They are partial revelations, “shadows” (as the New Testament calls them), prefiguring the total revelation of the “fullness of time” and preparing its coming.
When the time is fulfilled and the world is made ready, the Word and the Spirit come once more—no longer by their mere action and power, but now in their own persons, dwelling personally in the world.
The Word becomes flesh. The only-begotten Son is born as a man, Jesus of Nazareth. And the Spirit who is in him is given to all men to make them also sons of the Father in an eternal development of attaining His perfection by growing forever “to the measure of the stature of the fullness of Christ” (Eph 4:13).
Thus, in the New Testament we have the full epiphany of God, the full manifestation of the Holy Trinity: the Father through the Son in the Spirit to us; and we in the Spirit through the Son to the Father.