This is the announcement that fills us with hope and joy, with jubilation and gratitude. We were walking in darkness and a light shone upon us. We lived without God and without hope in this world, and the Son of God became man to be God with us and our Savior. 
The Lord God magnified his people and made our joy great. He has broken the heavy yoke of hopelessness and meaninglessness that weighed down our shoulders, and has given us the freedom of children and the hope of those who inherit grace, life, light and eternity. Let us rejoice, brothers, because God is with us; let us be filled with joy, because the Child who was born to us has borne our sins on the cross and has risen to conquer our death. Free from sin and death, our life radiates the light of God, and our heart overflows with confidence.
The Child who was born to us has borne our sins on the cross and has risen to conquer our death.
We do not know with precision neither the exact day nor the exact year of Jesus’ birth. Approximate calculations can be made, and, based on them, the calendar that counts the years from the birth of Christ was established in the 6th century; previously they were counted from the foundation of Rome. 
In addition to fixing the years since the birth of Christ, it was necessary to find a date during the year to celebrate him. This was a concern of the Christians of the third century. One criterion used was the belief that, since Jesus is the Son of God made man, everything in Him is perfect and nothing is coincidental. In the West, the conception of Jesus was related to the creation of the world. It was believed that the world was created on the spring equinox, which in those times fell on March 25. Then, it was thought that Jesus must have been conceived on that same day, because with his birth a new world began: the old creation was impregnated with the divinity of the Son of God. If Jesus was conceived on March 25, then his birth would have occurred nine months later, on December 25.
In the East, the calculations were different. There it was thought that Jesus must have been conceived on the same day he died. Jesus died during the celebration of the Jewish Passover, and according to the prevailing calculation of those times, they determined that he died on April 6. Therefore, they concluded that he was also conceived on April 6, and his birth would have occurred on January 6. Thus, in the East, the feast of the Epiphany or manifestation of the Lord was established. Both the conception of Christ linked to the creation of the world and that related to his death imply the conviction that with Christ the world is renewed and hope is born.
God’s grace has been manifested to save all people
St. Paul taught us today in the second reading: God’s grace has appeared to save all men.. That grace, that divine favor, has been manifested in Christ, who, by dying on the cross, enabled us to receive the forgiveness of sins freely, and, by rising from the dead, conquered death. He shares that victory with us as we unite ourselves to him through the gift of the Holy Spirit and communion with his Body, which we receive in faith.
The birth of Jesus in a manger, because there was no room for them in the inn, as St. Luke teaches us, is a foretaste of the rejection at the end of his life and his death on the cross. Therefore, the grace of God manifested in Christ teaches us to renounce irreligiousness and worldly desires. It teaches us that we cannot live without God or hope in this world and that our conduct cannot respond to worldly desires, but rather to a gaze fixed on God and on the heaven He offers us. Those of us who celebrate this Christmas can, therefore, live from now on in a sober, just and faithful way to God, awaiting the glorious coming of the great God and Savior, Christ Jesus, our hope.
Those of us who welcome him tonight through faith and Eucharistic communion are making a kind of rehearsal to receive him at the end of time, when he will come to complete in us the salvation already begun. He was born to give himself for us, to redeem us from all sin and purify us, so that we might become his people, fervently dedicated to doing good.
Today it is clear that God so loved the world that he gave his Son, that whoever believes in him should not perish but have eternal life..
This is the mystery of Christmas. This is the night in which God’s great love for us is revealed. Today it is clear that God so loved the world that he gave his Son, that whoever believes in him should not perish but have eternal life….. God did not send his Son to condemn the world, but to save it. But God saves in Christ those who accept him in faith. He does not impose his salvation, but offers it, and we receive it through faith and the sacraments.
It is customary at this time of the year to put the nativity in our homes. Its elaboration is usually a moment in which the whole family participates. It is an opportunity to catechize the children, explaining to them the meaning of the main figures: the Child Jesus, the Virgin Mary, St. Joseph, the angels, the shepherds, the magi. But it should not remain a mere effort of Christmas decoration; it should be a prayer made into figurines, in which we ask Jesus Christ to be born and grow in us through faith, hope and charity.
Let us do what the responsorial psalm invites us to do:
Let us sing to the Lord a new song; let the whole earth sing to him, let the heavens and the earth rejoice, let the sea roar, and all that is in it.
The birth of Christ renews creation itself, for when God becomes man, his divinity penetrates all that he has made and illumines it with his grace, which is why Christmas is a feast of light. The whole of creation rejoices in the knowledge that its destiny is not annihilation, but fullness in God.
In the year 2025, we will celebrate a Jubilee Year, the Jubilee of Hope. It will be a time for conversion, repentance and celebration of God’s mercy. May this Christmas prepare us to live in faith that time of grace. I wish you all a holy and happy Christmas.