The Fr. Karl Rahner, S.J. famous theologian, said the following in a Christmas homily.

God has entrusted his last, deepest, and most beautiful word to the world, in the Word made flesh. This Word says: I love you world, man and woman. I am here. I am with you. I am your life. I am your time. I weep your tears. I am your joy. Do not be afraid. When you do not know how to go any further, I am with you. I am in your anguish, because I suffered it myself. I am in your need and your death, because today I began to live and to die with you. I am your life. I promise you: for you, too, life is waiting. For you, too, the gates will open.

Meister Eckhart, 1260-1327, a mystic and theologian wrote:

"Christmas is the celebration of the birth of Jesus, as God-made-man in time; but if his birth is not 'reproduced' in my soul, what advantage is this celebration to me?" His thought was later developed by another mystic, Angelo Sitesio, who wrote: "Even if Christ were to be born a thousand times in Bethlehem, but is not born in my soul, I am lost forever."

It is obvious, therefore, that besides the physical birth of Jesus in Bethlehem, there is also a spiritual birth of Jesus, which takes place in our soul. This is what we call the Christmas of the soul, as opposed to the external Christmas celebrations comprised of all our Christmas activities from the writing of Christmas cards to the Christmas decorations and parties. It is this spiritual birth that affects our soul and enables us to partake of the eternal salvation that Jesus brought to us through his birth.