Essay
Morality & Hare
Why Morality Is Discovered, Not Invented
There is something odd about saying that slavery became wrong.
We ordinarily say that people came to recognize that slavery was wrong. The distinction matters. If a society once regarded human beings as property, its approval did not make slavery permissible while the approval lasted. The society was mistaken. Its laws were mistaken. Its customs were mistaken. The people who challenged those customs were not proposing a new morality in the way someone might propose a new traffic code. They were arguing that the prevailing morality had failed on its own terms.
That way of speaking commits us to more than we sometimes notice. To call a moral belief mistaken is to suppose there was something for the belief to get wrong. It does not tell us what moral truth consists in, still less how we can know it with certainty. But it rules out one easy answer: morality cannot simply be whatever a person or society happens to approve.
To say that morality is discovered rather than invented is to take that thought seriously. It does not require moral facts floating somewhere outside the universe, waiting for philosophers to detect them. Nor does it require intuition, revelation, or access to a mysterious moral faculty. It means that once we make moral judgments—once we say not merely what we want, but what ought to be done—we are answerable to constraints that our preferences did not create.
The difficult question is what those constraints are.
What We Are Doing When We Say “Ought”
Suppose I say, “I don’t want you to lie to me.” That tells you something about me. I dislike being lied to. Perhaps I become angry when it happens. Nothing in that statement, by itself, commits me to an opinion about what you may demand from me.
Now suppose I say, “You ought not lie to me.” I have said something different. I am no longer merely reporting a preference. I am prescribing a kind of conduct, and I have presented the prescription as one that applies because of features of the situation rather than because I happen to be the person who benefits from it.
That difference is central to R. M. Hare’s account of moral language. Moral judgments are prescriptive: they concern what is to be done. They are also universalizable. If I make a moral judgment about a particular case, I am committed to making the same judgment about other cases that are alike in all morally relevant respects.
The phrase “morally relevant” can sound as though it hides the entire answer, but it does not. There can be real differences between cases. A physician may permissibly cut a patient with a scalpel when a stranger may not. A parent may have obligations toward their child that they do not have toward every child. Universalizability does not require us to pretend that everyone is interchangeable. It requires us to identify the differences on which our judgment depends and to accept the same prescription wherever those differences recur.
This is already more demanding than consistency in the ordinary sense. A clever person can make almost any set of preferences superficially consistent by writing enough exceptions into the rules. “No one may take my property, but I may take yours” contains no formal contradiction if me and you are simply built into the rule.
Moral reasoning requires more because moral prescriptions must survive a change of position. If I prescribe a rule affecting you, I must be prepared to prescribe it in the corresponding case in which I occupy your position. And that does not mean imagining myself with all my present preferences magically transported into your body. Adequate role reversal requires representing the circumstances, interests, knowledge, and preferences I would have in the other position. The question is whether I can still prescribe the rule after the people affected by it have been fully represented.
This is where moral judgment begins to escape ownership by the person making it.
The Difference Between Choosing a Rule and Discovering a Constraint
We invent many rules. Americans drive on the right side of the road; other countries drive on the left. Nothing about reason itself selects one side. Once a convention has been established, there are excellent reasons to follow it, but another society could have chosen differently without making a moral error.
Morality cannot work entirely like that. Imagine a slaveholding society in which the institution is lawful, economically useful, culturally accepted, and endorsed by nearly everyone with political power. The society may have invented the rules governing slavery. It did not thereby invent the moral status of what those rules permitted.
The slaveholder who says, “It is permissible for me to own this person because I am the master and they are the slave,” has described the arrangement but has not justified it. The relevant question is whether the prescription survives when the positions are reversed and fully represented. Could the slaveholder prescribe the same institution while occupying the slave’s position, with the slave’s interests and preferences, including the preference not to be owned?
There are complications. A fanatic can announce that they would accept enslavement if the roles were reversed. Human beings can rationalize almost anything. This is why the informational requirement matters. Role reversal is not a ceremonial question—“Would you be okay with it?”—asked of someone who remains psychologically situated exactly where they started. The reasoner must adequately represent the affected positions, including the preferences that belong to them.
The resulting constraint was not chosen by the slaveholder or the slave. It arises from what the slaveholder has undertaken by making a moral prescription at all. They can abandon the claim that the arrangement is morally permissible and say instead that they have the power to impose it. What they cannot do is preserve all the authority of a moral judgment while exempting themselves from the conditions under which moral judgments can be justified.
That is the sense in which morality is discovered. We choose actions, institutions, conventions, and many of the circumstances in which moral questions arise. We do not get to choose what follows once we ask what prescriptions can be justified from every affected position.
Disagreement Does Not Turn Discovery Into Invention
The most obvious objection is that human beings disagree about morality. They disagree across cultures, across centuries, across political communities, and across the dinner table. If morality were something we discovered, why would we be so bad at discovering it?
But disagreement cannot do the work often assigned to it. People have disagreed about the movement of planets, the causes of disease, the age of the Earth, and tomorrow’s weather. The existence of disagreement tells us that an inquiry is difficult, or that the evidence is incomplete, or that the people conducting it are biased, poorly informed, differently situated, or using bad methods. It does not tell us whether there is something to be right about.
Moral disagreement has an additional complication: the answer can cost the reasoner something. A person investigating astronomy ordinarily has no personal stake in whether Jupiter has ninety-five moons rather than ninety-four. A person asking whether an institution is just may discover that the answer threatens their wealth, status, convenience, authority, or conception of themselves. Moral inquiry is conducted by investigators who are often beneficiaries of the proposition under investigation.
Cultural variation therefore cannot by itself establish that morality is conventional. Some variation reflects genuinely different circumstances. Some reflects disagreement about facts. Some reflects different judgments about which facts matter. Some reflects error, and some may expose errors in our own judgments. To decide among those possibilities requires moral argument. Declaring the disagreement itself proof that there is no answer merely decides the argument before conducting it.
The important distinction is between the origin of a moral belief and its justification. A belief may have been inherited from parents, absorbed from religion, produced by evolutionary pressures, taught in school, imposed by law, or acquired from the surrounding culture. Those facts may explain why someone believes it. They do not determine whether the belief survives moral scrutiny.
Morality Without a Moral Oracle
“Discovery” can nevertheless mislead if it suggests that moral truth is simply sitting there to be observed. We do not have a moral telescope. The facts alone do not announce their own moral significance, and universalizability is not an algorithm into which we enter a dispute and receive the correct answer.
What it gives us is a discipline of justification.
We begin with prescriptions about what people may or ought to do. We identify the facts on which those prescriptions depend. We ask whether the differences between cases are genuine and relevant rather than convenient labels. We represent the positions and preferences of the people affected. Then we ask whether we can continue to prescribe the rule when the positions are reversed.
Hard cases remain hard because the facts may be uncertain, preferences can conflict, consequences may be difficult to predict, and several prescriptions may survive the first rounds of scrutiny. Adequate information is an aspiration as well as a requirement; human reasoners almost never possess it perfectly. Moral discovery therefore offers no guarantee of certainty.
But uncertainty is different from invention. A physician may be uncertain which treatment is best without supposing that the answer is created by the physician’s preference. Moral reasoning likewise permits incompleteness, disagreement, and error while insisting that some reasons survive scrutiny better than others.
This is also why universalizability should not be confused with a veil of ignorance. The moral reasoner does not erase their identity, interests, or knowledge in order to choose rules from an abstract position in which no one knows who they will be. The relevant information is added, not removed. Each affected position has to be represented as fully as possible, precisely because the preferences and circumstances of the people occupying those positions matter to the judgment.
Morality becomes less arbitrary as the representation becomes more adequate.
What Moral Progress Means
The difference between invention and discovery becomes clearest when we talk about moral progress. If morality consists entirely of the norms a society constructs, then a change in those norms is simply a change. Abolition is different from slavery in the way one convention is different from another. We can prefer the later arrangement, celebrate it, and perhaps explain why it serves our values better, but calling it progress requires some standard that does not reduce to the fact that the later society endorses it.
Our ordinary moral judgments are stronger than that. We think a society can be wrong about people over whom it exercises complete power. We think a majority can be wrong about a minority. We think laws can be unjust while they are valid, customs can be cruel while they are customary, and reformers can be right before they persuade anyone else.
None of these propositions establishes a metaphysical theory of moral facts. They do reveal something about the kind of claims we are making. When we condemn an accepted injustice, we are not merely reporting that our preferences differ from those of the people who accepted it. We are claiming that their prescriptions could not be justified to the people on whom those prescriptions were imposed.
That claim can itself be challenged. Perhaps we have misunderstood the facts. Perhaps we have misrepresented a preference. Perhaps a difference we dismissed as irrelevant turns out to matter. Moral objectivity does not mean that our present judgments are privileged. It means precisely the opposite: our judgments are exposed to correction because they answer to something other than our having made them.
Discovery Without Mystery
The word discovered carries more metaphysical baggage than the argument needs. Moral truths need not resemble undiscovered planets, existing as objects in a realm beyond human experience. They are closer to constraints that become visible when we try to justify prescriptions from more than one position.
The underlying facts matter. Who is harmed? What does each person want? What alternatives exist? What did the agents know? What consequences can reasonably be expected? Which differences between cases actually bear on the prescription? Better factual knowledge can therefore change a moral conclusion, sometimes radically.
But the facts do not become morally relevant because the powerful declare them so. Nor does a society make a prescription defensible by agreeing to it among the people who benefit. Once a moral claim is made, the affected positions enter the inquiry whether the person making the claim welcomes them or not.
That is enough to distinguish discovery from invention. We invent the language in which moral arguments are conducted, just as we invent mathematical notation. We invent laws, customs, institutions, ceremonies, and countless rules for living together. We inherit values and revise them. We disagree, sometimes permanently, about what morality requires.
What we do not invent is the outcome by deciding in advance whose position counts.
A moral prescription has to survive universalization under adequate information, including full representation of the people affected by it. Sometimes we will not know whether it does. Sometimes reasonable people will disagree about the facts or about their relevance. Sometimes later generations will discover that distinctions their predecessors regarded as obvious were doing nothing more than protecting an advantage.
Morality is discovered in that demanding but unmysterious sense. We do not discover it by consulting a faculty that reveals moral truth, and we do not create it by preference, consensus, or authority. We discover what we can justifiably prescribe when no affected position is allowed to disappear from the reasoning.