The City of God in the City of Man: A Theology of Urban Engagement

In the fifth century, following the traumatic fall of the Roman Empire, Augustine of Hippo penned his seminal work, The City of God. In it, he explored the profound tension between two symbolic cities: the “City of Man,” which prioritizes human autonomy and temporal values, and the “City of God,” comprised of those who live for the glory of the Creator. Augustine’s central inquiry remains a defining challenge for the contemporary church: How does the City of God exist within the City of Man? When believers find themselves in a culture that does not share their values—or is even hostile to them—how are they to respond?

Historically, the church has often drifted toward three unproductive postures. The first is indifference, a withdrawal into a holy enclave that ignores the needs of the surrounding community. The second is hostility, a stance of anger that rails against the evils of the city while longing for its judgment. The third is conformity, where the church loses its distinctiveness by bending its values to mirror the prevailing culture. However, the biblical narrative offers a fourth way: the way of faithful engagement. This model is most clearly articulated in the prophet Jeremiah’s instructions to the Jewish exiles in Babylon.

The Mandate for the Exile

The context of Jeremiah’s ministry was one of national catastrophe. For forty years, he prophesied the coming judgment of Jerusalem due to the people’s covenant unfaithfulness. When the Babylonian Empire finally destroyed the city and the temple in 586 BC, the survivors were forcibly deported to a land five hundred miles away. This was a deliberate strategy of cultural assimilation; the Babylonians intended for the people of God to lose their identity and merge into the pagan landscape within a generation.

Jeremiah 29:1-3 (NASB)

Now these are the words of the letter which Jeremiah the prophet sent from Jerusalem to the rest of the elders of the exile, the priests, the prophets and all the people whom Nebuchadnezzar had taken into exile from Jerusalem to Babylon. (This was after King Jeconiah and the queen mother, the court officials, the princes of Judah and Jerusalem, the craftsmen and the smiths had departed from Jerusalem.) [The letter was sent] by the hand of Elasah the son of Shaphan, and Gemariah the son of Hilkiah, whom Zedekiah king of Judah sent to Babylon to Nebuchadnezzar king of Babylon, saying,

While false prophets offered empty promises of a quick return, Jeremiah delivered a counter-intuitive word from God. He commanded the exiles to settle in, build houses, and plant gardens. They were instructed to marry and raise families, envisioning a generational future in a land that flaunted idolatry and sexual immorality. Rather than retreating into bitterness or assimilating into Babylonian paganism, they were called to multiply and remain distinct while being deeply rooted in the physical place of their exile.

Jeremiah 29:4-6 (NASB)

’Thus says the LORD of hosts, the God of Israel, to all the exiles whom I have sent into exile from Jerusalem to Babylon, ’Build houses and live [in them]; and plant gardens and eat their produce. ’Take wives and become the fathers of sons and daughters, and take wives for your sons and give your daughters to husbands, that they may bear sons and daughters; and multiply there and do not decrease.

Seeking the Shalom of the City

The most radical element of Jeremiah’s instruction was the call to seek the “welfare” of the city. The Hebrew word used here is Shalom, a term that denotes far more than the mere absence of conflict. It represents a holistic state of health, peace, and flourishing—spiritual, physical, emotional, and relational. This command echoed the ancient promise given to Abraham, that through his descendants all the families of the earth would be blessed.

Genesis 12:3 (NASB)

And I will bless those who bless you, And the one who curses you I will curse. And in you all the families of the earth will be blessed.’

By seeking the Shalom of Babylon, the exiles were participating in the redemptive heart of God. They were to be a blessing to a city that did not want them, finding their own well-being tied to the well-being of their captors. This required a shift from a self-centered survivalist mindset to an outward-facing mission of service. The people of God were to be for the city, even as they remained distinct from its values.

Jeremiah 29:7 (NASB)

‘Seek the welfare of the city where I have sent you into exile, and pray to the LORD on its behalf; for in its welfare you will have welfare.’

The Discipline of Intercession

Central to this engagement was the command to pray for the city. For the Jewish exiles, prayer was not a vague sentiment but a structured discipline, often practiced three times a day. By commanding them to intercede for Babylon, God was ensuring that the city remained at the forefront of their spiritual lives. It is difficult to maintain a posture of hatred or indifference toward a people for whom one regularly intercedes.

This call to prayer anticipates the teachings of Jesus, who commanded His followers to love their enemies and pray for those who persecute them. Prayer serves as the bridge between the two cities, aligning the heart of the believer with the heart of God, who desires that all people might come to the knowledge of the truth. It recognizes that the ultimate welfare of any city is found in its reconciliation to the Creator.

The Church as Spiritual Exiles

The principles of Jeremiah 29 find a direct parallel in the New Testament’s description of the church. The apostle Peter identifies believers as “sojourners and exiles” in this world. This identity suggests that while Christians are citizens of a heavenly kingdom, they are strategically placed within earthly cities as ambassadors of Christ.

1 Peter 2:11 (NASB)

Beloved, I urge you as aliens and strangers to abstain from fleshly lusts which wage war against the soul.

As spiritual exiles, believers are called to live as salt and light, ensuring that their good works lead others to glorify God. This involves a commitment to the local context—embracing the people, the needs, and the challenges of the specific city where God has placed them. Whether one resides in a city by choice, by circumstance, or even by a sense of being “stuck,” the theological mandate remains the same: to embrace the place and its people as a strategic assignment from God.

Matthew 5:16 (NASB)

’Let your light shine before men in such a way that they may see your good works, and glorify your Father who is in heaven.

Gospel-Centered Service

Effective service in the city requires identifying the “Samarias” of our modern contexts—the neglected, the marginalized, and the places of brokenness. It involves moving toward the pain of the city with the hope of the gospel. When the church engages in the beautification of neighborhoods, the restoration of the incarcerated, or the protection of the vulnerable, it demonstrates the tangible love of Jesus.

However, social action alone is incomplete. While the City of Man and the City of God can agree that the alleviation of poverty and violence is a common good, the church offers a unique and eternal hope. Good deeds must be accompanied by the good news of the gospel. True transformation is not merely a change in behavior or environment but a change of heart that only the Holy Spirit can produce.

2 Corinthians 5:20 (NASB)

Therefore, we are ambassadors for Christ, as though God were making an appeal through us; we beg you on behalf of Christ, be reconciled to God.

Conclusion

The greatness of the Christian life in the city is measured not by cultural dominance, but by sacrificial service. Following the example of Jesus, who wept over the city of Jerusalem, the church is called to a posture of “brokenhearted joy.” Believers serve the city with a long-suffering mercy, knowing that they do not own the culture, but they serve the One who holds all things together. By seeking the Shalom of the earthly city, the church provides a prophetic glimpse of the coming City of God, where every tear will be wiped away and peace will reign eternal.

Luke 19:41 (NASB)

When He approached [Jerusalem], He saw the city and wept over it,