Book excerpt: It's the defining reality of all existence, the central fact of human history, and the heart of the Christian faith: God became a man and lived among us. More than just part of the Christmas story, the doctrine of the incarnation radically affects our understanding of God, humanity, life, death, and salvation. In The Incarnation of God, theology professors John Clark and Marcus Johnson explore this foundational Christian confession, examining its implications for the church's knowledge and worship of God. Grounded in Scripture and informed by church history, this book will help Christians rediscover the inestimable significance of the truth that the Son of God became what we are without ceasing to be the eternal God—the greatest mystery of the universe.