Cur Deus Homo, also known as Why God Became Man, is a theological treatise written by Saint Anselm of Canterbury in the 11th century. The book is a dialogue between Anselm and his student, Boso, in which they discuss the nature of sin, justice, and the need for redemption. Anselm argues that sin is a violation of God's honor and justice, and that only a perfect being can make amends for it. Therefore, God became man in the form of Jesus Christ to...