GK Chesterton may be my favorite author of all time. A Catholic, he was a journalist in England in the early 1900's and spent much of his efforts sparring with people like HG Wells and the disciples of Friedrich Nietzsche. Some of his books were immensely influential in CS Lewis' journey towards Christianity.My favorite book is his Orthodoxy, which is a fresh and extremely unique defense of Christianity written almost 100 years ago. Another one of his excellent books is The Everlasting Man, in which he seeks to defend Christianity as entirely unique from all other world religions becauseit is the only religion that meets all of man's appetites perfectly (for mythical wonder, for intellectual depth, and for the conquering of evil).
The first half of the book explains how human history played out in a way that perfectly prepared for the birth of Christ. The first chapter of that half is called "The Man in the Cave". The second half of the book explains how human history has been irreversibly and profoundly affected by the birth of Christ. The first chapter of that half is called "The God in the Cave".
I know it is pretty long, but it is worth it to take the time to read the following quote (one of my favorites) from that chapter on Christmas:
"Christmas for us in Christendom has become one thing, and in one sense even a simple thing. But like all the truths of that tradition, it is in another sense a very complex thing. Its unique note is the simultaneous striking of many notes; of humility, of gaiety, of gratitude, of mystical fear, but also of vigilance and of drama. It is not only an occasion for the peacemakers any more than for the merry makers; it is not only a Hindu peace conference any more than it is only a Scandinavian winter feast. There is something defiant in it also; something that makes the abrupt bells at midnight sound like the great guns of a battle that has just been won. All this indescribable thing that we call the Christmas atmosphere only bangs in the air as something like a lingering fragrance or fading vapor from the exultant, explosion of that one hour in the Judean hills nearly two thousand years ago. But the savor is still unmistakable, and it is something too subtle or too solitary to be covered by our use of the word peace. By the very nature of the story the rejoicings in the cavern were rejoicings in a fortress or an outlaws den; properly understood it' is not unduly flippant to say they were rejoicing in a dug-out. It is not only true that such a subterranean chamber was a hiding-place from enemies; and that the enemies were already scouring the stony plain that lay above it like a sky. It is not only that the very horse-hoofs of Herod might in that sense have passed like thunder over the sunken head of Christ. It is also that there is in that image a true idea of an outpost, of a piercing through the rock and an entrance into an enemy territory. There is in this buried divinity an idea of undermining the world; of shaking the towers and palaces from below; even as Herod the great king felt that earthquake under him and swayed with his swaying palace."

