CCC 457
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The Word became flesh for us in order to save us by reconciling us with God, who "loved us and sent his Son to be the expiation for our sins": "the Father has sent his Son as the Saviour of the world", and "he was revealed to take away sins": I Jn 4:10; 4:14; 3:5. Sick, our nature demanded to be healed; fallen, to be raised up; dead, to rise again. We had lost the possession of the good; it was necessary for it to be given back to us. Closed in the darkness, it was necessary to bring us the light; captives, we awaited a Saviour; prisoners, help; slaves, a liberator. Are these things minor or insignificant? Did they not move God to descend to human nature and visit it, since humanity was in so miserable and unhappy a state? St. Gregory of Nyssa, Orat. catech 15: PG — Patrologia Graeca (Migne)B.
Read the full chapter 2. I Believe in Jesus Christ, the Only Son of God ¶422–682