"The City of God" is a significant work by the early Christian philosopher Augustine of Hippo, written in response to the fall of Rome in 410 AD. The text contrasts the earthly city, characterized by sin and moral decay, with the heavenly city, representing divine grace and eternal life. Augustine argues that true fulfillment comes from faith in God rather than earthly pursuits. The book is divided into 22 books, addressing various themes such as the nature of God, the role of free will, and the relationship between faith and reason. It has had a profound influence on Christian theology and Western philosophy, shaping discussions about the nature of society and the divine.