I. WHY DID THE WORD BECOME FLESH?
The Word became flesh to be our model of holiness: "Take my yoke upon you, and learn from me." "I am the way, and the truth, and the life; no one comes to the Father, but by me." On the mountain of the Transfiguration, the Father commands: "Listen to him!" Jesus is the model for the Beatitudes and the norm of the new law: "Love one another as I have loved you." This love implies an effective offering of oneself, after his example.
Source: Catechism of the Catholic Church (Vatican.va)