← All writing Final · Oct 2025 · Updated Sep 2026

Utility of Truth

Why minds resist change. Evolution shaped us to track what works, not what's true, and that tells us how to plant seeds that can grow into changed minds.

Introduction

Has this ever happened to you? You spend weeks learning something new about the world, share it excitedly with friends, and get blank looks and a polite “I don’t know about that.”

For years I found this frustrating. Isn’t the truth more rewarding? Shouldn’t everyone want better knowledge?

I now think my frustration rested on a wrong assumption: that minds are built to track truth. They were shaped by evolution to track what works. This essay explains why, and what it means for anyone trying to change a mind, including their own.

1. Explore and Exploit

Ants make the pattern easy to see. Scout ants wander until one finds food. It heads home, leaving a pheromone trail. Other ants follow the trail, and each successful trip strengthens it. A few keep wandering, because no food source lasts forever. When the food runs out, fewer ants return, and the trail fades.

This is exploration, searching for something that works, and exploitation, putting resources into what already works. Notice what the colony never does: understand the food. It keeps whatever pays off and drops whatever doesn’t.

Our mental models behave much like those trails. A belief that pays off gets reinforced, and one that fails slowly fades. Like the ants, we rarely question a trail while it still leads to food.

2. Evolution Selects for What Works

The cognitive scientist Donald Hoffman argues that evolution tunes perception for fitness, not accuracy. A creature that sees only what is useful can outcompete one that sees reality in more detail than it needs.

Beliefs were shaped the same way. Ancestors whose ways of forming beliefs kept them alive passed those tendencies on, and their cultures passed on the beliefs themselves, accurate or not. So it helps to separate two things we usually lump together:

Utility: does this belief get results?
Truth: does this belief match reality?

Most of the time the two overlap, which is why we rarely notice the difference. When they come apart, evolution sides with utility.

The cost of that choice shows up on suburban lawns. To get rid of ants, homeowners put out poisoned bait. The ants do exactly what has always worked: find food, carry it home, feed the queen. The habit that kept the colony alive is the thing that destroys it. A strategy that tracks only what works has no defense when the world changes the rules.

We carry false beliefs the same way. They persist because they work, until the day they don’t.

3. Belief Is a Prediction

You can’t decide to find a joke funny, and you can’t choose to believe the moon is made of cheese. Belief isn’t a choice. It is the brain’s best prediction, given what it has seen and what it already expects. Researchers like Karl Friston and Andy Clark describe the brain as a prediction engine that updates when its predictions miss.

This explains why arguments so often fail. An argument asks someone to trade a belief that is working for one that, from where they stand, is only a claim. Until the old belief starts producing errors they can feel, they have little reason to update. That isn’t stubbornness. It’s the machine working as designed.

It also suggests who is most persuadable: people whose current models have stopped delivering.

4. When Truth Becomes Useful

If minds track utility, where does truth-seeking come from?

My conjecture is that it comes from failure. People learn which strategies work for them, and for most, trusting their group works well enough. Someone who seeks truth for its own sake has often learned the hard way that the group can be wrong, usually because people they trusted let them down in a way that mattered.

Put simply, truth is an emergent property of failed utility: we start to value it when the beliefs that served us stop working.

Karl Popper described knowledge as growing the same way: we make conjectures, find where they fail, and correct them. Failure is the raw material of learning, not its opposite. And once we learn from failure, truth pays for itself. More accurate models predict more, and better prediction gives us more control over the world.

Conclusion: Plant Seeds

So why is it so hard to change a mind? Because minds were built to keep what works, and a working belief gives them no reason to change.

This has changed how I approach disagreement. Winning the argument rarely matters. What matters is planting a seed: an idea that is already there when someone’s old model stops working. I can’t choose when that happens for anyone else. I can make sure a better explanation is waiting.

How the seed is offered matters too. History is hard on pioneers. Alan Turing answered one of the deepest questions in mathematics and was prosecuted by the country he helped save. But some pioneers found a shield. Richard Feynman used humor. Carl Sagan wrapped truth in wonder. Each offered truth in a form people could take in, even when it undercut what they believed.

It has also changed how I read my own discomfort. When the world stops fitting my model, that isn’t failure. It may be a sign that truth is near. Cyclic Rationality is my attempt at a method for going looking before the failure arrives.