Why Do We Want to Do What We Think Is Right?

Mia’s Sandwich: A Push That Came From Judging

Lunch break. Mia spots the new kid sitting alone, staring at an empty table. She thinks, It would be right to share my sandwich. No one forced her, but she feels a push — a quiet urge to walk over. She offers half. Later, a friend whispers that the new kid was rude earlier, and Mia changes her mind. Now she thinks it’s okay not to share, and the push disappears. That ordinary moment hides a deep puzzle: when we judge something right or wrong, why do we so often feel motivated to act that way?

Philosophers call this the phenomenon of moral motivation. Usually, when a person believes an action is morally right, they feel at least some pull to do it. If their judgment shifts, the motivation usually shifts too. The question isn’t whether the pull is always strong — sometimes it’s tiny. The real mystery is what kind of thing a moral judgment must be to move us at all. Exploring that mystery opens up arguments about desire, belief, and even whether moral truths exist.

What Kind of Thing Is a Moral Judgment?

To understand moral motivation, we first need to ask what a moral judgment is. Is it a belief — a mental state that tries to represent how the world really is? Or is it more like a desire — a state that pushes us to change the world?

Beliefs and desires seem to have different jobs. A belief aims to match reality, like a map. If the map says there’s a river ahead but you find dry land, the map is wrong — it’s failed its purpose. A desire, on the other hand, aims to make reality match it. If you’re hungry, the fact that the fridge is empty doesn’t make your hunger incorrect; it just means the world isn’t cooperating. This difference is sometimes called direction of fit: beliefs have a mind-to-world direction; desires have a world-to-mind direction.

If moral judgments are beliefs — like believing sharing is right — it looks hard to explain why they move us. Beliefs, after all, just tell us how things are. The 18th‑century Scottish philosopher David Hume (1711–1776) argued that reason alone, which forms beliefs, cannot produce action. Only a passion or desire can. On this view, called the Humean theory of motivation, a moral belief can motivate only if it teams up with a preexisting desire — maybe a deep desire to be a good person or a desire to avoid guilt.

But not everyone agrees. Some anti‑Humeans think certain beliefs, especially moral ones, can motivate all on their own. When you really see that keeping a promise is the right thing to do, they say, that very belief can stir you to keep it. You don’t need a separate engine; the belief itself carries force. The contemporary philosopher Russ Shafer‑Landau (born 1959) gives a simple example: a student convinces herself she wants to be a lawyer, enrolls in law school, then feels no drive and drops out — only to discover she loves carpentry. What moved her to enroll wasn’t a real desire for law, anti‑Humeans argue, but her mistaken belief that she had that desire. Cases like this, they say, show beliefs can push us even when no matching desire is there.

Could You Know It’s Wrong and Simply Not Care?

Even if moral judgments can motivate, a further question divides philosophers: Is the connection between moral judgment and motivation necessary, or is it just a common but contingent fact about humans?

Those who say it’s necessary hold a view called motivational judgment internalism (often just “internalism”). According to internalism, if you sincerely judge an action right, you must feel at least some motivation to do it — though that motivation might be overridden by stronger desires or blocked by depression. The motivation is part of what makes the mental state a genuine moral judgment. This would elegantly explain why changes in moral view so reliably bring changes in motivation: the shift is built into the nature of the judgment itself.

Critics put forward a test: the amoralist. Imagine someone who says, “I know helping is right, but I just don’t feel any pull to do it, and I don’t care.” Externalists — those who deny a necessary link — think such a person is perfectly possible. They see motivation as external to the judgment, depending on whatever desires a person happens to have. If the amoralist lacks the right desire (maybe they have no wish to be moral), their moral belief simply sits there unmoving. Internalists usually reply that the amoralist isn’t really making a sincere moral judgment — they might be using the words in an “inverted commas” sense, like a criminal who tells a judge, “I know what I did was ‘wrong’” only to get a lighter sentence, without genuinely believing it.

Real‑life cases make the debate feel urgent. Some people with damage to the ventromedial prefrontal cortex seem able to reason about right and wrong but show little emotional or motivational response. To some philosophers, this looks like a real‑world amoralist — a challenge to internalism. Others argue those patients don’t grasp moral concepts fully, or aren’t making genuine judgments at all. The dispute remains unsettled.

Plato’s Glowing Good and Mackie’s Queer World

The puzzle of moral motivation doesn’t just affect how we think about the mind — it can also threaten the idea that morality is real and objective.

J.L. Mackie (1917–1981) argued that if there were objective moral properties — real “rightness” and “wrongness” out in the world — they would have to be very strange. He pointed to Plato’s idea of the Form of the Good. In that ancient picture, simply knowing the Good would give a person both a direction and an overriding motive to pursue it; the motivation would be built right into the property itself, bypassing any personal desires. Mackie thought that’s what objective values would need to be like. But nothing else in the world works that way. Properties like roundness or being‑made‑of‑gold don’t reach out and push you. Moral properties with built‑in “to‑be‑pursuedness” would be “queer entities.” Mackie concluded they don’t exist. According to his error theory, when we say “sharing is right” we’re trying to state a truth about such odd properties — but we’re always mistaken. Moral talk is like confidently describing unicorns: the sentences mean something, but they’re false.

Most philosophers today, even those who believe in objective morality, think Mackie set the bar too high. A moral fact, they argue, doesn’t need to motivate all by itself, overriding every contrary desire. It can depend on our psychology — on human nature, sympathy, or a cultivated concern to be moral. The realist can accept that moral motivation is powerful but contingent, without accepting spooky properties. Still, Mackie’s challenge shows how deeply ideas about motivation run: they can lead us all the way to questioning whether moral truth exists at all.

Why It Matters: Is Morality Just a Matter of What You Want?

So why does this centuries‑old argument matter to you? Because it shapes how we think about guilt, moral education, and what kind of world we’re living in.

Suppose the externalist is right: moral judgments motivate only when paired with a desire like the desire to be a good person. Then what about someone who simply lacks that desire? Can we still say they ought to act differently? If the pull of rightness depends entirely on what you already want, morality can start to look a bit wobbly — always hanging on the particular hungers we happen to have. But many externalists think that’s okay. They point out that desires like sympathy and fairness are deep and widely shared; they aren’t random quirks. So moral motivation can be widespread and predictable, even if not inevitable.

Internalists, on the other hand, offer a picture where the normativity is tighter: making a sincere moral judgment already involves being moved, at least a little. That might make it seem as if you can’t escape morality’s grip, as long as you really see what’s right. But then they have to explain why some people seem to see it and still don’t act.

The debate also touches what happens when we try to raise kids to be kind. If moral judgment works like a belief that can motivate on its own, maybe we just need to help kids see the truth. But if motivation always needs a separate desire, then moral education must also cultivate the right wants — empathy, concern for fairness, a commitment to being moral. Both pictures have consequences for how we think about responsibility, punishment, and even whether we can blame someone who says, “I know it’s wrong, but I just don’t care.”

Think about it

1. If someone says, “I know lying is wrong, but I don’t feel any aversion to it at all,” would you still say they really believe lying is wrong? Why or why not?
2. Imagine you have a strong desire to eat a whole cake by yourself, but you judge that sharing it is the right thing to do. Where does your motivation to share come from — the judgment itself, or a deeper desire to be a good person? Can you tell the difference?
3. If moral beliefs didn’t automatically motivate people, would it be harder to teach children to be kind? What might need to change in how we explain right and wrong?