Outstanding! Athanasius wrote "On the Incarnation" to explain why Christ became a human (thus,it was the earliest writing we have soley dedicated to answer this question - it is like Anselm's "Cur Deo Homo" but about 700 years earlier!). Athansius explains that humans fell into death, through sin, because of the deception of the devil. God, who loves humankind, could not idly sit by and watch His creation crumble and be subject to the bondage of death so He sent His son, to become a human, and take death in our stead so that we could be healed and restored back into the image and likeness of God. This quick review does not do the book justice - take the time to read this, digest Athansius teaching, and be amazed at the great love God has for us and understand the answer to the ancient question: "Cur Deo Homo?" ("Why the God-Man?" or "Why did God become man?")