When was the last time you read an old book? C.S. Lewis had an opinion on this: “It is a good rule, after reading a new book, never to allow yourself another new one till you have read an old one in between.” Lewis urges Christian readers to step outside of their century to read the “old books.” In fact, he penned these words as part of an introduction to the over 1,600-year-old classic, On the Incarnation by Athanasius. As Christmas nears and we reflect on our Lord Jesus coming in the flesh, let us learn first-hand about the Incarnation from Athanasius, a Christian who suffered greatly to protect the biblical truth that Jesus is both fully God and fully man. Who Was Athanasius? Athanasius, an early Church Father, was born sometime during 296-300 A.D. in Alexandria, Egypt. The city of Alexandria played a pivotal role in the Eastern Roman Empire. Athanasius grew up during the reign of Diocletian, emperor of the Eastern Roman Empire, and his successor Galerius, both of whom violently persecuted Christians. As a young child, Athanasius saw followers of Christ driven from their homes, tortured, and martyred. Later, as a young adult, Athanasius studied under Alexander, bishop of Alexandria, and engaged in the great Trinitarian strife—the Arian controversy. Arius, a priest in Alexandria, denied the divinity of Jesus and taught the heresy that since Jesus is the Son of God, as a son, Jesus had to have a beginning and thus was a created being. He confused many in the early Church by falsely teaching that God the Father alone was truly God, and that Jesus his Son was not God, but instead, was the first and greatest creature made by the Father to accomplish man’s salvation. Bishop Alexander opposed Arius and fought to maintain the true deity of the eternal Christ....