The Good News of salvation is that God our Father has revealed himself to the created universe in the person of his only son, the Lord Jesus Christ. The mysterious and transcendent God of past ages, the one who dwells in unapproachable light, made himself known to mankind's first parents in the garden. Then, through the covenant with Noah, the election of Abraham, the formation of his people Israel, the Mosaic law, and the prophets He became more and more immanent.
As the Letter to the Hebrews tells us, in times past, God spoke in fragmentary and varied ways to our fathers through the prophets; in this the final age, he has spoken to us through his son, whom he has made heir of all things and through whom he first created the universe. This son is the reflection of the Father's glory, the exact representation of the Father's being, and he sustains all things by his powerful word (Letter to the Hebrews 1:1-3).
Jesus Christ is the eternal Word through which this revelation has been transmitted to us by the heavenly Father in the power of the Holy Spirit. Jesus Christ is the mediator and fullness of all revelation (Vatican II, Dogmatic Constitution on Divine Revelation, #2). If we would take all of the words of Scripture, all of the words of the Catechism and other important church documents, these many words all compress, condense, synthesize and distill into one word--the eternal Word--Jesus Christ. The great Carmelite saint and doctor of the church, St. John of the Cross, said it beautifully: "In giving us his Son, his only Word (for he possesses no other), he spoke everything to us at once in this sole Word--and he has no more to say...because what he spoke before to the prophets in parts, he has now spoken all at once by giving us the All Who is His Son" (Catechism #65; cf. St. John of the Cross, The Ascent of Mt. Carmel, 2, 22, 3-5). Divine revelation, quite simply, is God revealing himself to us in the person of his son, Jesus Christ. There will be no further public revelation, as the Catechism tells us (#66).
Analogies are useful, even though they are imperfect. God is one. He is also three. The one God, who is Father, Son, and Holy Spirit has revealed himself to us. This one-only divine revelation (the Word) is transmitted to us in a written form (sacred Scripture) and an oral form (sacred Tradition), and has one-only authentic and authoritative interpreter--the magisterium of the church. more...
Dieu le Roy.