I asked Claude: It seems that the The 1755 Lisbon Earthquake and Tsunami helds a proeminent case as example by philosophers of why a good God allows things such as that. Can you coment on that?

Excellent observation! The 1755 Lisbon Earthquake is indeed one of the most important historical events in the history of theodicy and philosophy. It fundamentally shook (pun intended) European intellectual confidence and triggered one of the most famous philosophical debates of the Enlightenment.

The Disaster

The earthquake struck on the morning of 1 November 1755, All Saints’ Day. Contemporary reports state that the earthquake lasted from three and a half to six minutes, causing fissures 5 metres (16 ft) wide in the city center. Survivors rushed to the open space of the docks for safety and watched as the sea receded, revealing a plain of mud littered with lost cargo and shipwrecks. Approximately 40 minutes after the earthquake, a tsunami engulfed the harbor and downtown area AUC Press.

Between 30,000 to 50,000 people died (some estimates higher). The earthquake had struck on an important religious holiday and had destroyed almost every important church in the city, causing anxiety and confusion amongst the citizens of a staunch and devout Roman Catholic country AUC Press.

The timing was devastating in multiple ways:

• It was All Saints’ Day, so churches were packed with worshippers
• The devout were literally killed while praying
• Meanwhile, Lisbon’s red-light district largely survived

This created an acute theological crisis: Why would God kill the faithful at prayer while sparing brothels?

Why This Earthquake Changed Philosophy

The Intellectual Context

The 18th century had been a period of philosophical optimism. The discoveries of Newton and Leibniz promised rational explanations of the order of nature, somehow in harmony with the designs of God JSTOR.

The dominant philosophy was Leibnizian optimism: This is “the best of all possible worlds.” Everything that seems evil actually serves a greater good in God’s perfect plan. Pope’s Essay on Man popularized this: “Whatever is, is right.”

This optimism was widespread among Enlightenment thinkers—the idea that reason could unlock nature’s secrets and show how everything ultimately makes sense.

Then Lisbon happened.

Voltaire’s Response: The Death of Optimism

Voltaire, the typical figure of the age and of the learned Reaction, had been deeply impressed by Newton while visiting in England, and continued to be an admirer of Leibniz after his return to France. It seemed to him that the mind of man, aided in his case by a deistic sense of a general and benign Providence, had taken the measure of the cosmos. In all this he was suddenly undeceived JSTOR.

Voltaire wrote his devastating Poème sur le désastre de Lisbonne (Poem on the Lisbon Disaster) within weeks:

Come, ye philosophers, who cry, “All’s well,” And contemplate this ruin of a world. Behold these shreds and cinders of your race, This child and mother heaped in common wreck, These scattered limbs beneath the marble shafts— A hundred thousand whom the earth devours, Who, torn and bloody, palpitating yet, Entombed beneath their hospitable roofs, In racking torment end their stricken lives. To those expiring murmurs of distress, To that appalling spectacle of woe, Will ye reply: “You do but illustrate The iron laws that chain the will of God HAL-SHS?

Voltaire’s argument: You cannot look at children crushed under rubble, mothers and infants “heaped in common wreck,” devout worshippers killed at prayer, and say “All is well” or “This serves a greater good.” That’s obscene.

Voltaire’s alternative is simply to refuse the optimistic “all is well” philosophy of Leibniz and Pope, and proclaim that genuine and not only apparent evil is indeed loose on Earth European Proceedings.

This led to his later satirical masterpiece Candide (1759), which mercilessly mocks Leibnizian optimism through the character of Dr. Pangloss, who insists everything is for the best even as absurd catastrophes pile up.

Rousseau’s Counter-Response

Rousseau, receiving Voltaire’s poem, wrote back criticizing him. Rousseau criticised Voltaire for seeking to apply science to spiritual questions and argued that evil is necessary to the existence of the universe and that particular evils form the general good Yaqeen Institute for Islamic Research.

But Rousseau added something genuinely original: Human responsibility for the disaster’s severity.

Jean-Jacques Rousseau was also influenced by the devastation following the earthquake, the severity of which he believed was due to too many people living within the close quarters of the city. Rousseau used the earthquake as an argument against cities as part of his desire for a more naturalistic way of life AUC Press.

Rousseau’s argument:

• Nature causes earthquakes, but humans made them deadly
• If people lived naturally, dispersed, not in dense cities with tall buildings, far fewer would have died
• Humans built seven-story buildings and packed thousands into small spaces
• The disaster’s magnitude reflects human choices, not divine malice

This was remarkably prescient—essentially the first “social science” view of disasters, recognizing that vulnerability is partly socially constructed.

Why Lisbon Was THE Case Study

Several factors made Lisbon uniquely powerful philosophically:

1. It Happened in “Civilized” Europe

Previous earthquakes (Lima 1746, China 1699) were distant and exotic. Lisbon was a major European capital—wealthy, cultured, Christian. It brought disaster home to European intellectuals.

2. The Timing (All Saints’ Day)

The theological problem was acute: Why would God strike the faithful at worship? Traditional explanations (divine punishment for sin) became absurd when the pious died and sinners survived.

3. The Completeness of Destruction

Large palaces, great mansions of the nobility, churches, convents and monasteries, besides libraries and invaluable works of art, were reduced to rubble in minutes, and the resulting fires consumed most of the wooden houses of the common people that were left standing after the quake MDPI.

It wasn’t just deaths—it was civilizational collapse. Libraries, art, centuries of culture destroyed instantly.

4. It Was Scientifically Observed

As the first earthquake studied scientifically for its effects over a large area, it led to the birth of modern seismology and earthquake engineering AUC Press.

This was perhaps the first “modern” disaster—recorded, measured, analyzed. It couldn’t be dismissed as legend or exaggeration.

5. It Challenged the Enlightenment Project

Thus it challenged the Enlightenment era optimism articulated by Leibniz and Pope, who solved the traditional problem of evil by asserting that God’s goodness ensured the goodness of Creation overall, implying that any appearance of evil is only apparent, due to humans’ inability to grasp its function within the whole Amazon.

The Enlightenment was about reason, progress, understanding nature. Lisbon showed nature’s brutal indifference and the limits of rational optimism.

Philosophical Impact

Theodor Adorno’s Assessment

Theodor W. Adorno wrote, “the earthquake of Lisbon sufficed to cure Voltaire of the theodicy of Leibniz” AUC Press (Negative Dialectics 361).

This is the key point: Lisbon killed naive theodicy. You couldn’t maintain Leibnizian optimism after Lisbon without seeming callous or delusional.

Impact on Philosophical Language

Werner Hamacher has claimed that the consequences of the earthquake extended into the vocabulary of philosophy, making the common metaphor of firm “grounding” for philosophers’ arguments shaky and uncertain: “Under the impression exerted by the Lisbon earthquake, which touched the European mind in one [of] its more sensitive epochs, the metaphor of ground and tremor completely lost their apparent innocence; they were no longer merely figures of speech” AUC Press.

Even philosophical metaphors changed. “Firm foundations” of knowledge became suspect when the actual ground proved so unstable.

Why Philosophers Keep Returning to Lisbon

Lisbon remains the paradigmatic case because it demonstrates:

The Problem of Natural Evil

Free will theodicies can explain moral evil (human cruelty). But earthquakes? Tsunamis? These have nothing to do with human choice (at least the earthquake itself, though Rousseau showed human choices affect the consequences).

The Gratuitousness Problem

The suffering seems utterly pointless. What possible “soul-making” or “greater good” justifies crushing children under rubble? The proportionality is absurd.

The Indiscriminate Nature

God doesn’t distinguish between righteous and wicked. The earthquake killed randomly. This undermines any “divine punishment” theodicy.

The Scale

Individual tragedies might be explained away. Mass catastrophe can’t be. When tens of thousands die at once, saying “God has mysterious reasons” sounds hollow.

The Lasting Lesson

Lisbon represents the moment when European philosophy had to confront that the universe is not obviously designed for human benefit. As Voltaire realized, nature operates by impersonal laws that don’t care about human welfare.

This pushed philosophy in several directions:

1. Atheism/Agnosticism: Maybe there is no benevolent God
2. Deism: God created but doesn’t intervene (Voltaire’s position)
3. Honest Mystery: We don’t know why God permits this (returning to Job’s humility)
4. Social Analysis: Focus on human responsibility for disaster consequences (Rousseau’s innovation)
5. Eschatological Hope: Justice must come in afterlife since it doesn’t come here

My Assessment (Claude)

Lisbon is the case study because it’s empirically undeniable, theologically devastating, and philosophically inescapable:

• You can’t explain it away as punishment (the pious died)
• You can’t attribute it to human choice (earthquakes aren’t moral agents)
• You can’t claim it serves obvious good (the destruction was gratuitous)
• You can’t dismiss it as minor (tens of thousands died)

It’s the perfect test case that breaks naive theodicies.

And honestly? I don’t think theodicy has ever fully recovered from Lisbon. Every theodicy since has to somehow address: “But what about Lisbon? What about the earthquake that killed worshippers at prayer on All Saints’ Day?”

The responses are all variations on “mystery” or “this life isn’t the whole story” or “focus on human responsibility for vulnerability.” But none are fully satisfying.

Lisbon showed that the universe doesn’t care about us. How you respond to that realization defines your theology.