In the sixth month, the angel Gabriel was sent from God to a town of Galilee called Nazareth, to a virgin betrothed to a man named Joseph, of the house of David, and the virgin’s name was Mary. And coming to her, he said, “Hail, favored one! The Lord is with you.” But she was greatly troubled at what was said and pondered what sort of greeting this might be. Then the angel said to her, “Do not be afraid, Mary, for you have found favor with God. Behold, you will conceive in your womb and bear a son, and you shall name him Jesus. He will be great and will be called Son of the Most High, and the Lord God will give him the throne of David his father, and he will rule over the house of Jacob forever, and of his kingdom there will be no end.” But Mary said to the angel, “How can this be, since I have no relations with a man?” And the angel said to her in reply, “The holy Spirit will come upon you, and the power of the Most High will overshadow you. Therefore the child to be born will be called holy, the Son of God. And behold, Elizabeth, your relative, has also conceived a son in her old age, and this is the sixth month for her who was called barren; for nothing will be impossible for God.” Mary said, “Behold, I am the handmaid of the Lord. May it be done to me according to your word.” Then the angel departed from her.

Luke 1:26-38

What the angel announced to Mary, that God would become man in the Person of Jesus Christ, is the most important event in human history. At the moment of Jesus’ conception, God Himself entered into human history. We call this the Incarnation: God become man in the Person of Jesus Christ. It is said that the Incarnation is the hinge of history. That is, the Incarnation begins the act of salvation. Everything before the Incarnation led up to this moment, and everything after the Incarnation is changed because of it. The Catechism of the Catholic Church lists four reasons for the Incarnation, four reasons God became man in the Person of Jesus Christ. We are going to learn about those reasons in this lesson.