Notes from the Wired

Selected Writings from Saint Augustine

July 23, 2026 | 8,319 words | 40min read

This summary and critic was created in the context of the seminar “Introduction to Saint Augustine,” which I attended at the Karlsruhe Institute of Technology. It is not a summary of a single work, but rather a summary of selected chapters from various works by him, such as The City of God or Confession.

Background

Augustine of Hippo (354–430) was a Christian bishop in North Africa, one of the most influential thinkers of late antiquity. His major work, The City of God, was written in the aftermath of the Sack of Rome (410), when Rome was captured for the first time in centuries during the migrations of various peoples.

This event led to widespread criticism of Christianity. Many pagans argued that Rome had prospered under the traditional Roman gods, but after turning to Christianity, the empire had declined and suffered disaster.

Augustine wrote The City of God as a response to these accusations. The work serves both as a defense of Christianity and as a broader philosophical and theological interpretation of history, arguing that earthly cities like Rome are ultimately transient, while the “City of God” is eternal and grounded in divine truth.

City of God, Book I, Chapter 1-2 and 7-15: Human Suffering in Gods World

In the present text, Augustine of Hippo explains why suffering exists, even for those who are Christians. To do this, he examines various forms of suffering that occurred during the destruction of Rome and argues why these are not actually so bad. I will first present these positions before offering criticism.

He begins by saying that many who criticize Christianity owe their survival to it. This happened, he claims, because the barbarians showed mercy out of respect for Christ (DCD I,1). He further explains that looting and killing are normal in war, whereas sparing churches is rather unusual, and that this mercy should be attributed not to the barbarians themselves but to Christ (DCD I,2;7).

Next, he addresses the question of why suffering befalls both good and bad people. He argues that there are several reasons:

In Chapter 10, he tries to comfort Christians by saying that they lost nothing truly valuable in the sack of Rome, since wealth and material goods are not essential—spiritual goods are. Moreover, loss helps detach people from material things. He also argues that even the death of Christians during the sack is not bad, since all people must die, and what matters is how one dies and what comes afterward (DCD I,11). A lack of burial is also not a problem, since funerals are primarily for the living (DCD I,13), and God will resurrect people regardless of the state of their bodies (DCD I,12). Finally, he claims that even captivity or slavery after the sack is not so terrible, since God is with people everywhere (DCD I,14–15).

I find that this text has several argumentative weaknesses. Chapters 1, 2, and 7 seem more like anecdotes than rigorous arguments. Augustine tells a vague story in which many people were spared in one place and not in another, and attributes this to God. The problem is that this account remains very unspecific: it lacks precise numbers or systematic comparisons. Even if his account is correct, there are many possible alternative explanations for why people were spared that have nothing to do with Christianity. Augustine would either need to refute these alternatives—which he does not—or provide a convincing argument for why Christ in particular is the cause, which is also missing.

Furthermore, in Chapter 9 he argues that one reason for the suffering of good people is that they, too, sin and therefore deserve punishment or purification. However, he does not consider the scale of suffering: if his claim were true, one would expect good people to experience less or milder suffering. In reality, suffering (such as illness or accidents) appears to be distributed largely independently of moral character.

Another issue is whether such great suffering is necessary at all to achieve the goals he names (e.g., detachment from material goods in Chapter 10). It seems plausible that such insights could be conveyed through much lesser suffering. For example, one can teach a child to stop at a red light without them first having to be hit by a car.

City of God, Book I, Chapters 16-22, 24-29, 31, 33-35: Human Suffering in Gods World

In Book I of City of God (chapters 16–22, 24–29, 31, 33–35), Augustine of Hippo develops a sustained argument about virtue, the soul, violence, and especially the moral status of suicide in response to the trauma of Rome’s sack.

A central theme in chapters 16–22 is that moral worth lies in the soul, not the body. Augustine argues that acts such as rape, though physically violating, do not corrupt a person’s inner virtue if their will remains pure. Purity is thus located in intention rather than bodily condition. From this, he concludes that suicide in response to rape is unjustified: the victim has not sinned and therefore should not punish themselves. In discussing examples from Roman history, he insists that even if society judges a victim harshly, divine judgment, grounded in truth, matters more than public opinion.

This leads into his broader argument against suicide. Augustine claims that the commandment “Thou shalt not kill” is absolute and includes killing oneself. Suicide is wrong because it involves usurping judgment that belongs only to legitimate authority, ultimately God. While killing plants and animals is permitted (since they lack rationality), human life is inviolable due to its rational nature. However, in chapter 21 he introduces apparent exceptions: killing may be justified if commanded by law or directly by God, such as in war or biblical narratives.

In chapter 22, Augustine rejects the idea that suicide could ever be virtuous. Even if motivated by fear of sin or a desire to preserve purity, it remains morally wrong. He argues that committing a certain sin (suicide) to avoid a possible future sin is irrational, especially since after death no repentance is possible. This idea is developed further in chapter 25, where he contends that one should prefer an uncertain future (where sin might occur) over a guaranteed sin that eliminates the possibility of repentance.

In chapters 24 and 26, Augustine considers examples of individuals who maintained virtue under extreme conditions or who took their own lives to avoid dishonor. While some of these figures were revered, Augustine cautiously suggests that such actions might only be justified if directly commanded by God—something not generally accessible to ordinary people. Thus, suicide remains broadly prohibited.

Chapter 27 addresses the argument that one might commit suicide after repenting, thereby avoiding future sin. Augustine dismisses this as a kind of madness, asserting that it misunderstands the nature of moral life. In chapter 28, he reflects on why God might allow the violation of virtuous individuals: possible reasons include humbling the proud, preventing future arrogance, or correcting misunderstandings about virtue—emphasizing again that true virtue resides in the soul, not the body.

Later chapters (29, 33–35) broaden the scope. Augustine contrasts Christian and pagan interpretations of disaster, arguing that Christians understand suffering as meaningful within divine providence, while pagans lack such a framework. He also claims that Rome’s survival and the refuge found in Christian spaces demonstrate God’s influence, even as he criticizes ongoing moral corruption among the Romans.

Despite the coherence of Augustine’s framework, several philosophical problems remain unresolved.

First, in chapter 20, Augustine grounds the prohibition against killing in the concept of rationality, claiming that humans, unlike animals or plants, possess a rational nature that grants them moral status. However, he does not explain why rationality is the निर्णing criterion for moral worth. What exactly constitutes rationality, and why should its absence justify domination or killing? This raises further tension with historical practices such as slavery, widely accepted in Augustine’s time and present in biblical contexts, since enslaved humans are clearly rational beings. If rationality grounds moral inviolability, the justification for treating some humans as property becomes deeply problematic.

Second, in chapter 21, Augustine introduces an apparent contradiction. He initially presents the commandment “Thou shalt not kill” as absolute, yet later allows exceptions when killing is sanctioned by human law or commanded by God. The appeal to divine command is internally consistent within his theology, but the inclusion of human law is more troubling. If divine law is supreme and absolute, it is unclear why or how human legal systems could legitimately override it. This seems to undermine the claimed absoluteness of the commandment.

Third, Augustine’s argument about suicide and rationality raises difficult edge cases. If the prohibition on killing is grounded in rational nature, what happens when a person loses that rationality, for example, in advanced stages of illnesses like Alzheimer’s disease? Augustine does not address whether such individuals retain the same moral status or whether his framework would imply different conclusions about self-killing in such circumstances.

Finally, in chapter 27, Augustine dismisses the argument that suicide could prevent future sin by calling it “madness,” but he does not fully engage with its underlying logic. If one accepts his premise that sin is the greatest evil and that repentance is necessary for salvation, then the idea of eliminating future sin through death, after repentance, seems to require a more substantial rebuttal. Simply labeling the position as irrational leaves a gap in the argument, suggesting that a deeper justification is missing.

Confessiones VII.viii.10 – VII.xiii.19: Nature of God

In Chapter 10, Confessions discusses why astrology cannot be true. He argues that twins are often born at the same moment under the same stars, yet they live very different lives and experience different fates. This shows that human destiny cannot be determined by the stars. Augustine explains that when astrologers sometimes seem correct, it is not because astrology is true, but because they are able to perceive things already present in a person’s soul, and ultimately this depends on God’s providence rather than celestial forces.

In Chapter 11, Augustine reflects on the unchanging nature of God and begins to connect this with the idea of life after death. He also wrestles deeply with the problem of evil. At this stage, Augustine describes an inner conflict within himself: although he knows he should value inward and spiritual things, he remains attached to external and worldly concerns.

In Chapter 12, Augustine explains that he became certain of God’s existence by turning away from external things and looking inward. Through inward reflection he discovered truths that surpassed the material world and pointed him toward God.

In Chapter 13, Augustine compares the teachings of the Platonists with the opening of the Gospel of John. He notices that both speak about the “Word” and that the Word is divine. Augustine is struck by the similarity between Platonic philosophy and Christian theology, especially in their understanding of a higher divine reality.

In Chapter 14, Augustine discusses the nature of Christ. The Son, Jesus Christ, is born not from human substance but from the substance of God. Yet Christ also takes on human form through an act of divine humility or self-emptying. Augustine emphasizes that Christ existed before time itself and later died for humanity’s sins, especially for the impious and sinful.

In Chapter 15, Augustine notes that both Christianity and the Platonists agree that God is incorruptible and unchanging. However, this raises a question for him: if God is incorruptible, why does Scripture describe corruption and idolatry in Genesis and in human history? Augustine is trying to reconcile the perfection of God with the evident corruption present in the world.

In Chapter 16, Augustine explains that he first came closer to God not through the Bible but through Platonic books. By looking inward, he experienced a vision of God that transcended his own being. He realized that God is superior because God is true being itself, whereas Augustine, as a created being, only exists through dependence on God. This insight humbles him and transforms his understanding of existence.

In Chapter 17, Augustine argues that everything below God lacks absolute being because all created things come from God and are changeable. Only God possesses absolute being because only God is completely unchanging. Created things exist, but their existence is imperfect and dependent.

In Chapter 18, Augustine develops his theory of evil. The supreme good, God, cannot be corrupted. However, corruption can only occur in things that are already good, because corruption is the loss or privation of some good. Something completely without goodness would not exist at all. Therefore, everything that exists must possess some goodness simply because it exists. Augustine concludes that evil is not a substance in itself, because if evil were a substance it would also possess goodness. Instead, evil is the privation or absence of goodness. Since all things are created by God, all created things are fundamentally good.

In Chapter 19, Augustine concludes that evil does not truly exist for God, nor for the universe as a whole, because nothing exists outside God’s creation. What humans perceive as evil often arises from conflicts of interest between different parts of creation. Yet every part of the universe contributes to the goodness of the whole. Therefore, all things should ultimately be praised as parts of God’s ordered creation. Augustine also argues that humans should not wish for individual things to become better in isolation, because the totality of creation together already forms a greater and more perfect good.

City of God XI: 2-4, 6 and Letter 120, 2-5: Knowledge, God and Time

Summary of City of God XI 2-4, 6

In City of God, Augustine begins in the second chapter by describing that humans cannot know God through sensory perception, but only internally through truth and the mind. However, because the human mind is weakened by errors and desires, it requires faith and Christ as a mediator—who is simultaneously God and man—in order to even be able to find the path to God. In the third chapter, he elaborates further that Christ, as the mediator, revealed God’s truth first through the prophets, then through himself, and finally through the apostles, and that this revelation was recorded in the Bible with the highest authority. Just as one trusts eyewitnesses when it comes to visible things, one should believe those who saw spiritual truths in the “inner light” of God when it comes to spiritual matters. In the fourth chapter, Augustine argues that the world is visible and God is invisible, but that through the order and beauty of creation, one can recognize that God created the world. Furthermore, he defends the view that the world has a temporal beginning without God’s eternal will changing in the process, and he criticizes the concept of an eternal, beginningless world as contradictory. Finally, in the sixth chapter, he explains that time can only exist where there is change and movement, which is why there could have been no time before creation. Therefore, God did not create the world within time, but rather simultaneously with time itself, since movement, change, and thus time only emerged alongside the created world.

Summary of Letter 120 (Paragraphs 2–5)

In Letter 120, Augustine criticizes Consentius in the second section for saying that faith is more important than reason, while simultaneously demanding a rational explanation of the Trinity, even though the authority of faith should actually take precedence in this area. In the third section, however, he emphasizes that faith and reason belong together: faith often comes first so that a human can understand at all, but what is believed should later also be comprehended through reason. In the fourth section, he explains that a person should remain in faith but must simultaneously strive for understanding by arriving at an ever-deeper insight step by step. Finally, in the fifth section, he states that some divine truths and miracles are difficult or even impossible to fully explain rationally, but they nonetheless serve an important function because they awaken faith and guide humans toward the truth.

Critique

In City of God, Augustine argues in the third chapter that a trustworthy mediator is needed, but he does not really explain why Jesus or the Bible itself should be considered trustworthy. This foundation is presupposed rather than justified.

At the end of Chapter 4, he simply asserts that the world is created and not eternal, but he provides no compelling argument for this. It would at least be conceivable that the universe is not eternal or does not originate from God, and he does not offer a truly independent justification against this, but rather a theological assumption.

In his argument about the soul in Chapter 4, he also presupposes its existence instead of justifying it.

Furthermore, in the letter, he argues that rationality only comes after faith. But this raises the question of how one is supposed to arrive at faith at all if not through some form of rationality.

Additionally, it seems somewhat contradictory: in the letter, he states that divine matters are ultimately not fully comprehensible to humans, yet in City of God, he nevertheless describes quite concretely how God created the world and how eternity and time function, which is strange.

Confession XI.xii.14 - XI.xxiv.28: Time

Augustine begins by addressing the question of what God was doing before the creation of heaven and earth. He rejects a sarcastic reply, that God was preparing hells for those who pry into such mysteries, preferring honest ignorance over ridicule. Instead, he asserts that God was not idle, nor was He “doing” anything, because time itself did not exist prior to creation. Since God created time along with the world, He cannot be subject to it. God exists in an eternal “Today,” distinct from the successive passing of human years, where He precedes all things past and transcends all things future.

Augustine then turns to a philosophical investigation into the nature of time. He observes that while we use the concept of time constantly, it is difficult to define. He argues that strictly speaking, the past no longer exists and the future does not yet exist; only the present exists. However, the present has no duration because it is fleeting. If the present stayed still, it would be eternity, not time. Therefore, time only exists insofar as it is moving toward non-existence.

This leads to a paradox regarding how we measure “long” or “short” periods of time, since neither the past nor the future actually exists to be measured. Augustine resolves this by locating time in the human mind. He argues that past events persist as memories and future events exist as expectations or predictions based on present causes. While the events themselves are not yet future or still past, they exist in the present as mental images. Thus, time is a distention of the mind, allowing us to measure what is not physically there.

Letter 157. 1-15: Gods Grace

In 414 or 415 Augustine replied to the previous letter from Hilary, who had asked Augustine a series of questions about various Pelagian teachings. Augustine begins by praising Hilary’s zeal for the word of God (paragraph 1 ). If, Augustine points out, some people claim that they can be without sin in this life, they should be confronted with the words of Saint John, who said that they are deceiving themselves, as well as with the fact that even Daniel prayed for the forgiveness of his sins (paragraph 2). With God’s help one can refrain from serious sins, but not from daily lesser sins, for which we must daily ask forgiveness (paragraph 3). Those who claim that some persons live without sin are perhaps tolerable, but those who say that free choice is sufficient for observing the commandments, even without God’s help, must be condemned (paragraph 4). With the help of God’s grace free choice can perform good works, but without his help it will not attain righteousness, as the petitions of the Lord’s prayer show (paragraph 5). The benefit of the law lies in its leading us to ask for the grace to fulfill what the law commands (paragraph 6). Those who reject the medicine of Christ’s grace are like sick people who are so deranged that they reject the help of a doctor (paragraph 7). Our free will is freer to the extent that it is healthier, and it is healthier to the extent that it is subject to grace (paragraph 8). Without grace the law makes sin abound, but God gives his grace that we may fulfill his command ments (paragraph 9). Grace does not take away our will but helps it (paragraph 10).

The Pelagian claim that infants who die without baptism cannot be lost because they are born without sin runs counter to the words of the apostle (paragraph 1 1 ). Paul teaches that all human beings contract sin from Adam by birth, not by imita tion of his sin (paragraph 1 2). As no one is born except under condemnation because of Adam, so no one is reborn for righteousness except through Christ (paragraph 13). The righteous men and women of the Old Testament were set free through faith in Christ who was to come, just as we are set free through faith in Christ who has come (paragraph 14). Through the law human beings became not merely sinners but transgressors, but the grace of Christ sets them free from all kinds of sin (paragraph 15).

City of God XIV 1-4, 6, 13: The two Cities I

Chapter 1

Augustine argues that humanity was originally created by God as one family, meant to live in harmony and without death, but this condition was lost when the first humans disobeyed God. Their sin didn’t just affect them personally, it corrupted human nature itself, so that all their descendants inherit a tendency toward sin and mortality. Because of this, humanity is also under the threat of eternal punishment, the “second death,” unless rescued by God’s grace, which saves some undeservedly.

From this, Augustine concludes that despite all cultural differences in language, customs, and nations, humanity is ultimately divided into two spiritual “cities.” One is made up of those who live oriented toward earthly and bodily desires, while the other consists of those who orient their lives toward God and spiritual truth. These two cities are not separate societies in a physical sense but two ways of loving and living that run through all of human history.

Chapter 2

Augustine is trying to clarify what Scripture means by “living according to the flesh,” and he warns that it is easy to misunderstand this expression. One might think it simply refers to bodily indulgence, things like pleasure, sexuality, or physical excess, so that philosophers like Epicureans would count as “fleshly,” while others who value the soul, like Stoics, would seem “spiritual.” But Augustine argues that this is not what Scripture means.

Instead, he explains that the Bible uses the word “flesh” in a broader symbolic sense, often meaning the whole human person, not just the body. Just as Scripture sometimes uses “flesh” to mean “human being” in general, “living according to the flesh” refers to a whole orientation of life, not just bodily behavior. To support this, he points to Paul’s list of “works of the flesh,” which includes not only bodily sins like sexual immorality and drunkenness, but also inner sins like hatred, jealousy, anger, and division. These are clearly not physical actions in themselves but states of the soul.

From this Augustine concludes that “living according to the flesh” means living in a disordered way as a whole person, body and soul together, where one is governed by vice, pride, and distorted desire. Even someone who avoids bodily pleasures can still be “carnal” if their inner life is filled with hatred, envy, or spiritual error. So for Augustine, the key distinction is not between body and soul, but between rightly ordered and wrongly ordered love within the whole human being.

Chapter 3

Augustine is arguing against the idea that the body (the “flesh”) is the source of sin. He acknowledges that the body, in its present corrupt state, does weigh down the soul and makes human life more difficult and prone to temptation. This condition is linked to humanity’s fallen state, described elsewhere as a punishment following the first sin. However, he insists that this corruption of the body is not the cause of sin, but itself a result of sin. In other words, it is not the body that makes the soul sinful; rather, the soul’s original turning away from God brought disorder into human nature, including the body.

To support this, Augustine draws on Christian scripture, especially Paul’s idea that the “corruptible body” burdens the soul, but he interprets this carefully: the body itself is not evil, only its corrupted condition is. Therefore, the proper aim is not to escape the body altogether, but to have it transformed into an incorruptible, immortal state.

He then strengthens his argument by pointing out that many sins are clearly not bodily in nature. Hatred, pride, envy, and strife are spiritual or psychological vices, yet Scripture still calls them “works of the flesh.” This shows that “flesh” does not literally mean the physical body, but refers more broadly to the whole human being living in a disordered way.

To make the point even sharper, Augustine notes that even the devil, who has no body, exhibits the worst of these vices, especially pride and envy. Therefore, sin cannot originate from the body, since purely spiritual beings can also sin. Instead, sin originates in the will: in the choice to turn away from God and live “according to oneself.” The body is involved in the consequences of sin, but the root cause lies in the corrupted will of the soul.

Chapter 4

Augustine is clarifying what it means to “live according to man” versus “live according to God,” and he pushes his earlier distinction even further. To live according to man is to live in a way that is turned inward, relying on oneself rather than on God. For Augustine, this is not just morally flawed but fundamentally false, he calls it a kind of “lie.” The reason is that human beings were created to depend on God for their good and happiness, not to be self-sufficient. So when a person tries to secure happiness by their own direction, apart from God, they are acting against their created nature, and this misalignment is what he calls sin.

Living according to God, by contrast, means living in truth, because God is truth itself. It is to align one’s will with God’s will rather than one’s own isolated desires. Augustine even connects this to the idea that sin is a kind of “falsehood”: it promises happiness but actually leads to misery, because true happiness can only come from God.

He then ties this back to his earlier language of “flesh” and “spirit.” Scripture sometimes calls this distinction “carnal” versus “spiritual,” but Augustine says these are not separate groups of people in a physical sense. Instead, they are different ways of living as a whole person. “Carnal” or “animal” man simply means human beings who live according to themselves, while “spiritual” man is one who lives according to God.

To support this, he points out that Scripture often uses parts of a human being, like “flesh” or “soul”, to mean the whole person. So when Paul says “you are carnal” or “you are men,” he is not making different categories of human nature, but saying the same thing in different ways: you are living as merely human, rather than as oriented toward God. And for Augustine, the striking implication is that to truly live according to God is to be elevated beyond mere humanity, participating in a higher mode of existence he even describes as a kind of “divine” life.

Chapter 6

Augustine is explaining how all human emotions ultimately come from the will, meaning the basic direction or orientation of a person’s inner life. He argues that feelings like desire, joy, fear, and sadness are not separate forces that control us, but different expressions of the will depending on how it relates to things. Desire and joy are forms of the will when it agrees with or seeks what it wants, while fear and sadness are forms of the will when it resists or rejects what it does not want. In this sense, emotions are not neutral happenings in the soul; they reflect what the will is set toward.

From this, Augustine draws an ethical conclusion: the moral quality of all these emotions depends entirely on whether the will itself is rightly ordered. If the will is directed toward God, what he calls “living according to God”, then the emotions are rightly ordered and become good. If the will is turned away from God and toward itself, then the emotions become distorted and lead to vice.

He then applies this to how we relate to other people. Since no human being is evil by nature but only through vice, a rightly ordered will must distinguish between the person and their wrongdoing. We should reject and “hate” the vice, meaning the moral corruption, but still love the person as God’s creation. In Augustine’s view, a properly ordered love does not confuse moral judgment with hatred of persons; it aims at the restoration of what is good while rejecting only what is disordered.

Chapter 13

Augustine is arguing that the first sin of Adam and Eve was not a sudden, isolated act, but the result of a prior inner corruption of the will. Before they disobeyed God outwardly, their will had already turned inward in a hidden way. The root of this turning is pride, which Augustine defines as the desire for undue self-exaltation, when a creature stops seeking fulfillment in God and instead tries to become its own center and source of satisfaction.

For Augustine, this is a fundamental distortion of human nature. Human beings are created to find their good in God, who is the highest and unchanging good. When the will turns away from God and toward the self, it does not gain true independence but actually diminishes itself, because it is abandoning the source of its own fullness. This inward turning is already a kind of “fall,” even before any external action happens. The visible act of eating the forbidden fruit is therefore only the outward expression of an already existing inner disorder.

He connects this to the deeper structure of the “two cities”: the city of God is formed by love of God and humility, while the city of the devil is formed by love of self and pride. Pride is what defines this fallen orientation, because it replaces dependence on God with self-sufficiency. But this self-sufficiency is an illusion, by trying to become “like God” through its own power, the creature actually becomes less than it was, drifting toward non-being and disorder.

Augustine also emphasizes that this fall is not something imposed from outside but arises from the will itself. That is why he says the devil could only tempt humanity because humanity had already begun to “live for itself.” The temptation succeeds because the desire to be self-directed was already present internally.

Finally, Augustine draws a moral lesson: even painful failure and shame can be healing if they expose this hidden pride. An obvious sin can break the illusion of self-sufficiency and lead a person back to humility and dependence on God. In this way, humility is not weakness but the true ordering of the soul toward its highest good, while pride is a self-destructive turning inward that constitutes the essence of sin.

City of God XV 1-7: The Two Cities II

Chapter 1

Augustine is now laying out the grand historical structure of his whole work: human history is the unfolding of two “lines” or “cities” that begin with Cain and Abel and continue until the end of time. These two cities are not physical nations but two communities defined by their orientation of love, one toward God and one toward the self.

He explains that Cain represents the “earthly city,” the community of those who live according to man, while Abel represents the “city of God,” those who live according to God. This pattern is not random but reflects a deeper spiritual logic that also appears in every individual life: in each person, the “carnal” or self-centered orientation comes first, and only later (if at all) is it transformed into a spiritual orientation through grace.

Augustine emphasizes that all humans begin from a “condemned mass” of fallen humanity, meaning that no one is naturally part of the city of God by their own effort. Membership in the city of God is therefore entirely dependent on divine grace, which transforms and “grafts” a person into a new life in Christ. He uses Paul’s image of the potter shaping vessels from the same lump of clay: some are formed for dishonor, others for honor, not by human merit but by God’s will.

Importantly, Augustine stresses that this ordering does not mean everyone will become good, but that no one becomes good except by first being in a fallen condition. The city of God begins small and hidden in history, often appearing weak or alien in the world, but it grows through grace and ultimately reaches its fulfillment in the resurrection and eternal reign with God.

Cain’s building of a city symbolizes the earthly city’s focus on temporal stability, power, and self-sufficiency, while Abel’s lack of a city represents the pilgrim nature of the righteous, who do not settle permanently in this world. The city of God, though present in history, is ultimately “above”, its true home is not in earthly structures but in eternal communion with God.

Chapter 2

Augustine is extending his “two cities” framework by interpreting the story of Abraham’s two sons, Hagar’s son Ishmael and Sarah’s son Isaac, as an allegory of two kinds of humanity. He explains that Scripture often works on more than one level: certain historical communities or institutions can function as symbols pointing beyond themselves to deeper spiritual realities.

In this reading, Ishmael, born from the slave woman Hagar, represents life “according to the flesh”, that is, life rooted in human effort, natural generation, and attachment to earthly structures. Isaac, born to the free woman Sarah through God’s promise, represents life “according to the spirit,” meaning life that exists through divine grace rather than human achievement. Paul’s interpretation in Galatians is, for Augustine, authoritative proof that these two births symbolize the two covenants and ultimately the two cities: the earthly city and the city of God.

Augustine emphasizes that even within the “earthly city” there is a symbolic role in salvation history. The historical city of Jerusalem, and even parts of the old covenant community, function as “images” or “shadows” pointing toward the true, heavenly Jerusalem. But these images are not ultimate in themselves, they exist to signify something higher that is only fully revealed in the city of God.

He also stresses the difference in origin between the two cities. Citizens of the earthly city are born through fallen human nature (“vitiated nature”), while citizens of the heavenly city are born through grace, which heals and elevates nature. This is why he uses Paul’s language of “vessels of wrath” and “vessels of mercy”: the distinction is not primarily cultural or moral achievement, but whether a person remains in natural fallen condition or is transformed by divine grace.

So the core idea is that human history contains both literal societies and symbolic meanings, but underneath them all runs the deeper division between self-generated life and grace-given life—the earthly city versus the heavenly city.

Chapter 3

Augustine uses Sarah’s barrenness and the birth of Isaac to contrast human nature with divine grace. Sarah’s inability to have children represents fallen human nature, which on its own cannot produce true spiritual life. Ishmael is born through ordinary human means, so he symbolizes what comes “according to the flesh”, not evil in itself, but tied to natural effort and human initiative.

Isaac, however, is born only because God intervenes when nature has reached its limit. He therefore represents grace: what God gives freely rather than what humans can achieve. For Augustine, this shows that citizens of the city of God are not self-made but “given,” formed by divine gift rather than natural capacity.

Chapter 4

Augustine describes the “earthly city” as a community that seeks its good in this world: peace, security, and material satisfaction. This kind of peace is real and even a gift from God, but it is limited and fragile because it is tied to temporal things.

Because its goods are limited, the earthly city is often divided within itself: groups compete, fight wars, and struggle for control. Even its victories are unstable, if it becomes proud, it becomes morally worse; if it remains aware of its fragility, it still cannot secure lasting peace.

For Augustine, the key point is that the earthly city is not evil in itself. Its pursuit of peace and order is a genuine good, but it is an imperfect one. The problem arises when it treats these temporary goods as ultimate, forgetting the higher, eternal peace of the city of God. When that happens, its desires become disordered, and its conflicts and misery inevitably increase.

Chapter 5

Augustine uses the story of Cain and Abel, and the Roman myth of Romulus and Remus, to illustrate the nature of the “earthly city.” Its founding principle, he argues, is not harmony but rivalry rooted in pride and envy. Cain, the first “founder” of the earthly city, kills his brother Abel out of envy, symbolizing the hatred of the good simply because it is good. This act becomes an archetype for all later earthly political foundations.

He then draws a parallel with Rome: Romulus kills his brother Remus, showing that even the great earthly empire is founded on the same logic of conflict and exclusion. The desire to have sole glory leads to violence, because shared greatness is rejected in favor of individual dominance.

Augustine contrasts this with the city of God, where goods like virtue and goodness are not diminished but increased when shared. In the earthly city, however, rivalry for limited glory leads to division, war, and instability, even within individuals, where conflicting desires struggle against each other.

Ultimately, he extends the idea beyond history into psychology: conflict exists not only between people and cities, but within each person, where flesh and spirit are in tension. The earthly city is therefore marked by layered conflict: between individuals, within societies, and within the human soul itself.

Chapter 6

Augustine is emphasizing that even the citizens of the city of God are not yet free from weakness and inner struggle while they live in this world. The disobedience and corruption that afflict human nature are not part of how humans were originally created, but are punishments for the first sin. Because of this fallen condition, even those who belong to God still experience temptation, conflict, and moral weakness during their earthly life.

However, Augustine stresses that these weaknesses are meant to be healed, not ignored. The Christian life is therefore a process of mutual support, forgiveness, correction, and patience among believers. He draws heavily on biblical teachings that emphasize bearing one another’s burdens, forgiving offenses, and restoring those who fall into sin gently. The goal of these practices is to preserve peace within the community, which reflects the deeper peace of the city of God.

A key idea here is that moral healing is not achieved by human effort alone. External teaching and correction are not sufficient unless God’s inner grace also works within the soul. Augustine distinguishes between external influences (like preaching or moral instruction) and the internal action of the Holy Spirit, who transforms the will itself.

He also connects this to his doctrine of grace and predestination: God distinguishes between those who ultimately accept grace and those who do not, though this happens through a hidden and just divine plan. In this life, even the redeemed still struggle with sin, but when grace fully heals the soul, it is gradually freed from domination by sinful desire. Ultimately, this healing will be completed in the eternal peace of the city of God, where the soul will no longer be capable of sin and will exist in perfect harmony with God.

Chapter 7

Augustine interprets the story of Cain as a case study in how sin works internally before it becomes an external act. Cain’s murder of Abel does not arise suddenly; it grows out of an already disordered heart marked by envy. When God rejects Cain’s sacrifice but accepts Abel’s, Cain becomes angry and jealous. Augustine reads God’s warning as an attempt to expose and correct this inner disorder before it becomes action.

He focuses especially on God’s mysterious instruction that Cain must “rule over” sin. Augustine explains that this does not mean ruling over Abel, but over the inner movement of sinful desire itself, especially envy. Sin, in this sense, is something that first stirs within the soul, but can still be resisted if the will is rightly ordered. If it is not resisted, it grows and eventually leads to outward evil actions, as it does with Cain.

From this, Augustine draws a general moral psychology: sin is not primarily external behavior but an internal misordering of desire, where the lower part of the self (concupiscence or impulse) tries to dominate the rational will. Virtue consists in the will governing these impulses rather than being ruled by them.

Cain, however, refuses this divine correction. Instead of turning inward in repentance, he allows envy to grow until it results in murder. Augustine then interprets Cain as the archetype of the earthly city: a life driven by pride, envy, and refusal of correction. He even extends this typologically to the Jews’ rejection of Christ, though he signals this as an allegorical level of interpretation.

Overall, the chapter emphasizes that sin begins as an internal resistance to God’s guidance, and that divine warning is always given before outward destruction occurs, but can be refused through the will’s pride.

City of God XIX 4-8, 10-11: The Highest Good

4: Augustine argues that the supreme good is not found in earthly pleasures, bodily goods, or human virtue alone, as philosophers claim, but in eternal life with God, which requires faith because human existence remains corrupted by suffering, sin, and inner conflict. Even the highest virtues of this life: prudence, temperance, justice, and courage, show humanity’s imperfection because they exist only to struggle against evils that cannot be fully overcome until the final salvation promised by God.

5: Although human beings naturally need social life and community, earthly societies are filled with instability, conflict, and betrayal, making true and lasting peace impossible without God.

6: Human justice is inevitably imperfect because judges cannot know hidden truths and are forced to risk harming the innocent, revealing the misery of earthly life even when people act with good intentions.

7: Human society is plagued by division and suffering, from the barriers of language to the horrors of war, and even supposedly just wars are ultimately tragic because they arise from human wrongdoing and disorder.

8: Even the best human friendships cannot provide complete security or lasting happiness because the dangers of earthly life threaten friends with suffering, betrayal, or death, leaving true consolation only in the hope of eternal life with God.

10: The trials and anxieties of earthly life strengthen the saints’ longing for the perfect peace of eternal life, where the virtues no longer struggle against evil but receive their final reward in everlasting harmony with God.

11: The ultimate end and highest good of the City of God is eternal peace, which is inseparable from eternal life and consists in the perfect, unchanging enjoyment of God without conflict or disturbance.

City of God XIX 12-17, 21: War and Peace

12: Augustine argues that all beings, even those who wage war or act unjustly, ultimately seek peace, because every creature desires some form of order and harmony, although only the just seek the true peace found in alignment with God rather than the selfish peace of domination.

13: All forms of peace are expressions of the universal order established by God, and even suffering and punishment participate in this order because all creatures retain some goodness and are judged according to their alignment or disorder with divine law.

14: Human peace is properly ordered when earthly desires are subordinated to rational knowledge and ultimately to obedience to God, leading people to love and serve others through just authority rather than domination.

15: Human beings were created to rule only over irrational creatures, not over one another, and that slavery and domination arise from sin as a punishment for disorder, while true freedom consists in being free from sinful desires rather than merely being free from human masters.

16: True authority is a form of loving responsibility rather than domination, as just rulers, including household heads, should guide and correct those under their care for their good, with domestic order serving as the foundation for the peace and order of society.

17: The earthly and heavenly cities differ in their ultimate goals: the earthly city seeks temporal peace and worldly goods, while the heavenly city uses earthly peace only as a means toward eternal peace with God, obeying earthly laws unless they conflict with true worship.

21: The Roman Republic, according to Cicero’s definition of a true republic as the common good of a people united by justice, never truly existed because Rome lacked true justice, which requires right relationship with God and therefore cannot exist in a society devoted to false gods.

Sermon 348, Letter 228: Augustine on the Vandal invasion of his Home

In Sermon 348, Augustine argues that true courage does not consist in the absence of fear, but in the fear of God that leads a person toward love and ultimately perfect charity. Fear initially guides humans away from wrongdoing through concern for punishment, but as love of God becomes complete, this imperfect fear is replaced by a deeper confidence and freedom from anxiety. However, Augustine distinguishes this from prideful fearlessness, criticizing the Stoics and Epicureans for mistaking emotional hardness or self-sufficiency for true virtue. Genuine compassion and moral sensitivity, he argues, require a healthy soul animated by God, not the numbness of someone who feels no suffering. Finally, Augustine distinguishes the fear that charity removes, the fear of losing worldly goods or punishment, from the enduring “chaste fear of the Lord,” which is the reverent concern of remaining united with God forever.

For the summary of Letter 228, I will just quote the summary of the book where I got the letter from:

In 429, after the beginning of the Vandal invasion, Augustine wrote to Honoratus, the bishop of Thiave in Numidiu. who had consulted him about how the Catholic clergy should behave under the threat of the imminent invasion. Augustine tells Honoratus that he thought that he had said everything necessary on the topic in a letter to Quodvultdeus, of which he had sent a copy to Honoratus, namely, that the clergy should not deprive the people of God of the ministry needed especially in a time of danger (paragraph 1 ). Augustine argues that neither the words nor the example of Christ nor the actions of Saint Paul justify the clergy’s abandoning the churches of Christ (paragraph 2). The words of Saint John, in fact, urge pastors to lay down their lives for their brothers and sisters (paragraph 3). Augustine admits that pastors may flee if they are not prevented by their duties to the Church (paragraph 4). He replies to Honoratus' argument that it is useless for bishops to remain and to witness the slaughter of the people by saying that, if all the people flee, the clergy may flee as well (para graph 5). Augustine defends the action of Athanasius, the bishop of Alexandria, who fled because he in particular was the object of Constantius’ persecution, for his flight did not deprive the people of ministers (paragraph 6). He reminds Honoratus that the clergy ought to fear spiritual evils more than bodily sufferings (paragraph 7), and he spells out the spiritual evils that the people of God suffer when they are abandoned by the ministers of the Church (paragraph 8). Hence Honoratus should now see what he had written that he did not see, namely, the great good that the people of God derive in times of danger if they are not aban doned by the ministers of Christ (paragraph 9). He explains the conditions under which priests may flee, using the examples of Athanasius and King David (para graph 10). But when clergy and laity face a common danger, the clergy may not abandon the people of God (paragraph 1 1 ). If some of the clergy should flee and some should remain with the people who cannot flee, they should be chosen by lot (paragraph 12). Furthermore, the faithful should be informed of why the clergy are not fleeing so that the people themselves do not think that they must remain (paragraph 13). Finally, Augustine advises Honoratus that amid such dangers it is best that we pray to God to show us his mercy (paragraph 14).

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