7/2/2026
Yesterday I discussed the Peloponnesian War and Thucydides' famous observation that "War is a violent teacher," comparing some of his insights with what happened during China's Cultural Revolution. Before continuing, here are a few basic facts about the war.
Location: The eastern Mediterranean
Period: 431–404 BC (27 years)
Main issue: Fight for hegemony over the Greek world
Outcome: Athens lost its maritime empire and dominance in the Aegean, bringing its Golden Age to an end. Sparta emerged as the leading Greek power.
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Major alliances:
Athens led the Delian League, which consisted of roughly 150–200 member states.
Sparta led the Peloponnesian League, with about 30–40 allies, including Corinth, Thebes, and Megara.
Now let me continue with yesterday's discussion.
3. Fear reshapes human behavior
Thucydides repeatedly emphasizes the role of fear—fear of enemies, fear of being suspected, and fear of appearing insufficiently loyal. Under such pressures, people often found themselves doing things they would never have imagined in ordinary times.
The Cultural Revolution also created an atmosphere of pervasive fear. Remaining silent could be dangerous, yet speaking against the prevailing political climate could be more dangerous. Many people's choices were constrained by fear that they perceived.
4. Social trust erodes
Healthy societies depend on trust—trust in our families, colleagues, neighbors, institutions, and communities. Periods of prolonged conflict and social chaos gradually destroy that trust.
People begin asking themselves, "Who might report me?" or "Whom can I safely trust?" Once those questions become part of everyday life, social relationships are fundamentally altered. Rebuilding trust afterward can take years, even generations.
5. Circumstances shape behavior—but do not determine it
Perhaps Thucydides' deepest insight is that extreme circumstances exert tremendous pressure on human behavior.
That does not mean everyone responds in the same way.
Even during the Cultural Revolution, some actively participated in persecution, some quietly protected those under attack, some kept their heads down in order to survive, and some accepted great personal risks to act according to their principles.
Circumstances shape behavior, but they do not determine it completely.
That is why Thucydides remains remarkably relevant today. More than simply writing about ancient Greece, he was identifying enduring patterns of human behavior that can emerge whenever societies experience prolonged fear, violence, or institutional collapse.
This reminds me of Aleksandr Solzhenitsyn's famous observation:
"The line dividing good and evil cuts through the heart of every human being."
The two thinkers complement each other. Thucydides emphasizes the immense power of external circumstances; Solzhenitsyn reminds us that individuals retain moral agency even under extraordinary pressure.
Ultimately, the larger question is not simply what war does to people. It is this:
What happens to human beings when the structures that sustain civilization—law, trust, stable institutions, and ordinary routines—begin to collapse?
War is one way that can happen. Revolution, civil conflict, state failure, famine, and other forms of prolonged upheaval can produce similar conditions. When those foundations weaken, fear replaces trust, survival instinct begins to outweigh moral and principle, and civilization itself proves more fragile than we often imagine.
That is why Thucydides still speaks to us nearly 2,500 years later.
More on this book later.