Today is the seventh day of the Octave of Christmas.
In today’s Liturgy of the Hours, Office of Readings Pope St. Gregory the Great meditates not just on our human dignity being elevated by becoming members of the Body of Christ in Baptism, but also on our dignity being elevated by sharing in His Nativity, his coming into the world like us, as a baby. He shared our humanity, and through that sharing gave us a share in His divinity.
Had Margaret Sanger grasped that truth, that cornerstone of Christian Anthropology, we would be inhabiting a very different world today. Science cannot blind itself to its crossroads with Christian Anthropology without resulting in unspeakable tragedy, as we have seen again and again.
A sermon of Pope St Leo the Great
The birthday of the Lord is the birthday of peace.
“God’s Son did not disdain to become a baby. Although with the passing of the years he moved from infancy to maturity, and although with the triumph of his passion and resurrection all the actions of humility which he undertook for us were finished, still today’s festival renews for us the holy childhood of Jesus born of the Virgin Mary. In adoring the birth of our Saviour, we find we are celebrating the commencement of our own life, for the birth of Christ is the source of life for Christian folk, and the birthday of the Head is the birthday of the body.
Every individual that is called has his own place, and all the sons of the Church are separated from one another by intervals of time. Nevertheless, just as the entire body of the faithful is born in the font of baptism, crucified with Christ in his passion, raised again in his resurrection, and placed at the Father’s right hand in his ascension, so with Him are they born in this nativity.
For this is true of any believer in whatever part of the world, that once he is reborn in Christ he abandons the old paths of his original nature and passes into a new man by being reborn. He is no longer counted as part of his earthly father’s stock but among the seed of the Saviour, who became the Son of man in order that we might have the power to be the sons of God.
For unless He came down to us in this humiliation, no one could reach his presence by any merits of his own.
The very greatness of the gift conferred demands of us reverence worthy of its splendour. For, as the blessed Apostle teaches, We have received not the spirit of this world but the Spirit which is of God, that we may know the things which are given us by God. That Spirit can in no other way be rightly worshipped, except by offering him that which we received from him.
But in the treasures of the Lord’s bounty what can we find so suitable to the honour of the present feast as the peace which at the Lord’s nativity was first proclaimed by the angel-choir?
For it is that peace which brings forth the sons of God. That peace is the nurse of love and the mother of unity, the rest of the blessed and our eternal home. That peace has the special task of joining to God those whom it removes from the world.
So those who are born not of blood nor of the will of the flesh nor of the will of man but of God must offer to the Father the unanimity of peace-loving sons, and all of them, adopted parts of the mystical Body of Christ, must meet in the First-begotten of the new creation. He came to do not his own will but the will of the one who sent him; and so too the Father in his gracious favour has adopted as his heirs not those that are discordant nor those that are unlike him, but those that are one with him in feeling and in affection. Those who are re-modelled after one pattern must have a spirit like the model.
The birthday of the Lord is the birthday of peace: for thus says the Apostle, He is our peace, who made both one; because whether we are Jew or Gentile, through Him we have access in one Spirit to the Father.”
Coming Home 
This comment is not really relevant to your post but I find the painting you have posted very nice. What caught my eye was the rather unhappy look on St. Joseph’s face. I have a beautiful Byzantine cross that a friend gave to me. The rather doleful facial expression and even St. Joseph’s pose – leaning the head in the hand is the same.
I’ve seen that look on new fathers before 😉