The city of God
Augustine writes in response to Rome's fall
The sack of Rome in 410 AD has produced a theological crisis as much as a political one. The pagans have a devastating argument: Christianity destroyed Rome. The empire abandoned its gods for the Christian God, and the Christian God has allowed the eternal city to be sacked for the first time in eight centuries.
Augustine hears this argument everywhere — in the refugees flooding into North Africa, in the letters he receives, in the conversations in the streets of Hippo. It demands a response.
He begins writing in 413 AD and does not finish until 426 AD. The City of God runs to twenty-two books and is the most ambitious work of theology in the first millennium of the church.
His argument is vast but its spine is simple: there are two cities, built on two loves. The earthly city is built on love of self to the point of contempt for God — it is the civilization of human achievement, of empire and culture and all the magnificent things humanity builds when it puts itself at the center. The City of God is built on love of God to the point of contempt for self — it is the community of those whose allegiance is to something that outlasts every human empire.
These two cities are intermingled in history. You cannot point to Rome and say: that is the earthly city. You cannot point to the church and say: that is the City of God. Both cities exist in every human institution, in every human heart.
But they will be separated at the end. And what was built for eternity will remain.
“Two cities have been formed by two loves: the earthly by the love of self, even to the contempt of God; the heavenly by the love of God, even to the contempt of self.”
— Augustine, City of God XIV.28, c. 413–426 AD
“For we don't have here an enduring city, but we seek that which is to come.”
Augustine wrote The City of God because people were treating Rome's fall as a theological emergency. His response was to reframe the entire question: you were building on the wrong foundation.
Not because Rome was bad, but because Rome was temporary — and treating the temporary as permanent produces the kind of catastrophic disillusionment that Augustine is responding to.
Every generation has its Rome — the institution, the nation, the system, the certainty that seemed permanent and turned out not to be. The question Augustine presses into every such moment is not why did this fall, but what were you building that required it not to?
Build on what lasts. Not as an abstraction — specifically. Identify the foundation that cannot be sacked, and shift your weight there while you still have the choice.