Reflecting on our life experience, we are continually astonished by how ultimately short and ephemeral life is. So we often find ourselves asking: what meaning can we give to our days? What meaning, in particular, can we give to the days of toil and grief? This is a question that permeates history, indeed it runs through the heart of every generation and every individual. But there is an answer: it is written on the face of a Child who was born in Bethlehem two thousand years ago, and is today the Living One, risen for ever from the dead. From within the fabric of humanity, rent asunder by so much injustice, wickedness and violence, there bursts forth in an unforeseen way the joyful and liberating novelty of Christ our Saviour, who leads us to contemplate the goodness and tenderness of God through the mystery of his Incarnation and Birth. The everlasting God has entered our history and he remains present in a unique way in the person of Jesus, his incarnate Son, our Saviour, who came down to earth to renew humanity radically and to free us from sin and death, to raise us to the dignity of God's children. Christmas not only recalls the historical fulfilment of this truth that concerns us directly, but in a mysterious and real way, gives it to us afresh....
"When the time had fully come, God sent forth his Son, born of woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons" (Gal 4:4-5). These words penetrate the heart of the history of us all and illumine it, or rather, they save it, because since the Day of the Lord's Nativity, the fullness of time has reached us. So there is no more room for anxiety in the face of time that passes, never to return; now there is room for unlimited trust in God, by whom we know we are loved, for whom we live and to whom our life is directed as we await his definitive return. Since the Saviour came down from heaven, man has ceased to be the slave of time that passes to no avail, marked by toil, sadness and pain. Man is son of a God who has entered time so as to redeem it from meaninglessness and negativity, a God who has redeemed all humanity, giving it everlasting love as a new perspective of life.
Benedict XVI, from the Homily at First Vespers of the Octave of Christmas