When someone says torture is wrong, they usually don't mean it's just their personal preference. They mean it's actually wrong — wrong everywhere, for everyone, in some deep and absolute sense. That instinct, the feeling that morality is built into the fabric of reality, has a long intellectual history. It's called natural law.

Enlightenment thinkers took this idea and ran with it. They claimed that reason alone could uncover moral truths as solid as the laws of physics. It was a bold move — and a deeply useful fiction. Understanding why they made this argument, and where it breaks down, tells us something important about how modern human rights actually work.

In the seventeenth and eighteenth centuries, Isaac Newton changed everything. He showed that the physical world operated according to discoverable, universal laws. If gravity worked the same way in London and Beijing, thinkers like John Locke and Samuel Pufendorf asked a natural next question: could morality work the same way?

The idea was seductive. If you could strip away culture, tradition, and religious dogma, perhaps pure reason would reveal ethical rules as clean and reliable as mathematical equations. Locke argued that life, liberty, and property were natural rights — not gifts from a king, but features of reality itself. Hugo Grotius went further, claiming natural law would hold even if God did not exist. Morality, in this view, was something you discovered, not something you invented.

This was revolutionary. It meant you didn't need a pope or a monarch to tell you right from wrong. You just needed to think clearly. But it also rested on a massive assumption: that human reason is a neutral instrument, untouched by the very culture it claims to see past. That assumption would prove far harder to defend than anyone expected.

Takeaway

The Enlightenment's greatest intellectual gamble was treating morality like science — something objective, discoverable, and universal. The power of that gamble didn't depend on it being true.

Here's the uncomfortable part. When Enlightenment philosophers sat down to reason their way to universal moral truths, they kept arriving at conclusions that looked suspiciously European. Individual property rights. Monogamous marriage. Representative government. The "laws of nature" turned out to mirror the preferences of educated European men with remarkable consistency.

This wasn't always intentional bad faith. It was something more subtle: the inability to see your own assumptions. Kant, one of the sharpest minds in history, argued that reason could produce moral laws valid for all rational beings — and simultaneously wrote that non-European peoples were less capable of rational thought. The blind spot is staggering. But it reveals something important about how natural law reasoning actually works. You start from what feels obvious to you, then you call it universal.

Critics from outside Europe noticed this quickly. Colonised peoples were told their customs violated "natural law," while European customs were presented as the rational default. The supposedly universal framework became, in practice, a tool for asserting one culture's superiority. This doesn't mean every Enlightenment moral claim was wrong. But it does mean the method — trusting reason alone to transcend culture — was far less reliable than its advocates believed.

Takeaway

When someone claims to have found a truth that transcends all culture, check whose culture it happens to match. Reason is powerful, but it never operates in a vacuum.

So if natural law isn't really natural — if it's a human construction dressed up in the language of objectivity — should we abandon it? This is where things get interesting. Because the fiction of universal moral law may be one of the most useful ideas humanity has ever produced.

Consider human rights. The 1948 Universal Declaration of Human Rights doesn't say, "Here are some values that Western democracies find appealing." It says these rights belong to every human being by virtue of being human. That's a natural law claim. And it works precisely because it refuses to be modest. If human rights were framed as merely one culture's preferences, any government could dismiss them by saying, "That's your tradition, not ours." The language of universality makes rights harder to reject.

The philosopher Jacques Maritain, who helped draft the Declaration, reportedly said the committee could agree on the rights — as long as no one asked why. That pragmatic silence is revealing. You don't need to agree on whether morality is written into the cosmos. You just need to act as if it is. Strategic universalism means holding two ideas at once: moral truths are human-made, and treating them as absolute makes the world more humane.

Takeaway

Sometimes the most honest position is to use a fiction knowingly. Treating human rights as universal isn't naïve — it's a deliberate strategy that protects real people.

Natural law was never really about discovering morality in the wild. It was about giving human values the authority they needed to challenge kings, empires, and tyrants. The Enlightenment thinkers who championed it were both visionary and blind — they built powerful tools from flawed assumptions.

Understanding this doesn't weaken human rights. It strengthens them. When you know the foundation is human-made, you can maintain it more honestly — repairing its biases without abandoning its purpose. The rules don't exist in nature. But they might be worth defending anyway.