From Karl Rahner, “Understanding Christmas,” Theological Investigations, Volume XXIII (New York: Cross Road Publishing Company, 1992):
The eternal future has entered our time. Its brightness is still dazzling, so that we believe it to be night. But it is a blessed night, a night that is already warmed and illuminated, a beautiful night, cosy and sheltering, because of the eternal day that it carries in its dark womb. It is silent night, holy night. But it is so for us only if we allow the stillness of that night to enter our inner person, then in our heart too ‘all is calm.’ And that is not difficult. For such a loneliness and stillness are not heavy. Its only heaviness is that which belongs to all sublime things that are both simple and great.
Yes, we are lonely. There exists in our heart an inner land, where we are alone, to which nobody finds the way except God. This innermost unreachable chamber in our heart exists. The question is whether we, in a foolishly guilty way, avoid it, because nobody else and nothing of what is familiar to us on earth can enter into it with us. Let us enter there ever so quietly! Let us shut the door behind us! Let us listen to the ineffable melody that fills the silence of that night. Here the silent and lonely soul sings for the God of her heart her finest and most personal song. And she may be sure that God hears it. For this song no longer has to seek the beloved God beyond the stars in that inaccessible light where he dwells and where no one can see him. Because it is Christmas, because the Word was made flesh, God is near, and the faintest word in the quiet chamber of our heart, the word of love, reaches his ear and his heart.