Natural Law January 9, 2022 Updated: September 14, 2026 10 min read THY-REALITY

The Moral Minimum: What Do We Owe One Another Without a Shared Metaphysics?

If we disagree about God, metaphysics or objective morality, is there still a minimal boundary of harm, coercion, deception and responsibility without which freedom becomes merely the privilege of the stronger?

“Is Morality Objective or Only a Matter of Culture?” already asked whether morality is objective or merely a matter of culture. this article therefore does not repeat the same metaethical dispute. It asks a more practical question: if people disagree about God, metaphysics, the nature of moral facts or the ultimate theory of the good, is there nevertheless a moral minimum without which a free society collapses into a contest of power?

This minimum is not a complete moral system. It does not tell us which family form, economy, spiritual path or lifestyle is best. It tries to identify a narrower boundary: when a person ceases to treat another as a free agent and instead treats that person as an object of utility, power or ideology. At its core are harm, consent, truthfulness, reciprocity, property, responsibility and limits on coercion.

THY-REALITY will avoid two opposite errors. Broad cross-cultural agreement is not proof of objective moral truth; it may reflect shared biology and recurrent problems of cooperation. But cultural difference likewise does not mean that no practice can be criticized beyond local custom. History is full of rules that were legal, normal and institutionally protected yet are now understood as violations of persons.

Natural Law is used here as the claim that states and majorities do not create morality by voting. But that claim must also accept rational and evidentiary audit. If we speak of a universal moral boundary, we must explain why it should bind a person who does not share our theology, culture or political identity.

A moral minimum is not a complete theory of the good

Metaethics asks what moral claims are and whether they can be objectively true. Practical ethics often has to decide before that dispute is settled. Two people may understand God, consciousness or the ultimate meaning of life very differently and still agree that deliberately torturing an innocent person for pleasure, taking another's property without justification, or securing consent through deception requires extraordinary justification or is ordinarily wrong.

Such common ground does not prove realism. A constructivist may understand it as the outcome of fair rational procedures, a naturalist as rules protecting beings with certain needs and vulnerabilities, a theist as a reflection of natural or divine order, and a relativist as a very broad overlap of human norms. this article therefore does not hide metaphysical differences. It searches for the place where different theories can meet in publicly examinable reasons.

This matters politically as well. The state should not gain unlimited permission to coerce merely because citizens lack a shared metaphysics. On the contrary: the greater the plurality of worldviews, the stronger the demand that coercion be justified by reasons that go beyond 'this is what we decided'.

Harm is a powerful signal, but it is not the whole of morality

Human beings can suffer physically, psychologically, socially and materially. This vulnerability is one of the strongest common facts on which moral argument can be built. It is therefore unsurprising that theories ranging from utilitarianism to human-rights ethics and Natural Law assign major importance to harm.

Yet 'do no harm' does not solve every problem. Surgery can cause pain and save a life; truth can hurt while deception may be an even deeper violation of autonomy; self-defence may harm an aggressor. We therefore have to distinguish harm as a fact from unjustified harm as a moral judgment.

A moral minimum does not say that every causing of harm is forbidden. It places a burden of justification on it: who created the danger, whether a less harmful option exists, whether the response is proportionate, and whether a person is being used merely as a means to an end that person did not choose.

Consent: the boundary between cooperation and using a person

Consent is one of the strongest practical bridges between rival moral theories. When a competent adult understands the relevant information and accepts a risk without coercion, the moral structure differs from a case in which the same outcome is achieved through threats, concealment or manipulation.

But consent is not a magic word. A child, a person without decision-making capacity or someone under overwhelming economic or institutional pressure may formally say yes without the conditions for genuinely free choice being present. Nor can a person give meaningful consent to an agreement when essential information has deliberately been withheld.

The moral minimum therefore requires more than a signature or click. It requires capacity, intelligibility, sufficient information, a real possibility of refusal and the absence of impermissible coercion. A system that manufactures apparent agreement does not respect freedom merely because it possesses a form.

Truth is not a luxury: autonomy requires reliable information

Lying is morally significant even when it produces no immediate visible injury. It can deprive a person of the possibility of choosing on the basis of reality. Systematic deception is therefore an intrusion into agency: another actor shapes a person's choice by deliberately altering the informational environment.

This does not mean we owe every truth to everyone or that privacy disappears. There is an important difference between silence, confidentiality, legitimate secrecy and active deception. the preceding articles on “Intelligence services: why do democracies build secret institutions?”, “Psychological operations: how information becomes a weapon” and “Secrecy, classification and declassification: how the state produces secrets” already showed that state secrecy can protect a real interest or can shield an institution from accountability.

The moral question is therefore whether information is being withheld to protect someone from an unjustified intrusion, or whether another person is intentionally prevented from informed judgment in order to produce behaviour they would otherwise reject. Here epistemology becomes directly moral.

Reciprocity, promises and property: cooperation needs predictability

Cross-cultural research finds broad positive valuation of reciprocity, fair division and respect for prior possession. Curry, Mullins and Whitehouse identified seven recurring cooperative moral rules across ethnographic records from 60 societies. This is an important empirical finding, but it is not metaphysical proof that any of those norms is objectively true.

It nevertheless helps explain why promises, contracts, trust and a boundary between mine and yours matter so much to free cooperation. If no one knows whether an agreement will hold, whether the stronger party will keep another person's work, or whether deception will be rewarded, social interaction becomes more costly and more dependent on coercion.

Natural Law here is not the slogan that property is sacred regardless of circumstances. It asks about legitimate acquisition, exchange, use and repair of harm. Theft, fraud and coerced transfer are not morally cleansed merely because an institution performs them or because they appear in a rulebook.

Legal is not the same as moral

The most important political consequence of a moral minimum is the separation of law from morality. A legal system determines what the state permits, requires or punishes. It does not follow that its content is morally right. If law itself created morality, the idea of an unjust law would be incoherent.

The Nuremberg Principles expressed this distinction in legal language after the Second World War: domestic law does not by itself relieve an individual of responsibility for conduct constituting a crime under international law. This does not prove an entire Natural Law philosophy, but it is a powerful institutional example of recognizing that 'ordered and legal' does not exhaust the question of responsibility.

The same must apply to democratic majorities. Voting is a decision procedure, not a machine for producing moral truth. Majorities can legitimately choose among many common policies; their mandate needs a boundary when it begins turning other people into means without rights over their bodies, conscience, speech, property or fair process.

The judges panel during testimony at the Nuremberg Trials in 1945. — The Nuremberg Trials provide a concrete historical example of the boundary between positive law and responsibility. The photograph does not prove a complete theory of Natural Law; it does show an institutional case in which appeal to domestic legality was not accepted as a sufficient answer to the question of personal responsibility. Image: United States Army Signal Corps / Harvard Law School Library / Wikimedia Commons Public domain — work of the U.S. Federal Government

Cross-cultural similarity: important evidence, not a final answer

Empirical anthropology undermines the simplistic claim that cultures share no moral common ground. In a major comparison of 60 societies, helping kin and group, reciprocity, bravery, respect, fair division and recognition of possession were consistently valued positively. Developmental research likewise shows that fairness concerns emerge early, even though culture strongly shapes how they are expressed.

But universality of belief is not the same as objective truth. All humans could share the same evolved bias. Conversely, differences in the application of norms do not prove that no deeper common principle exists: two cultures may both value protecting children while disagreeing, because of factual beliefs, about what protection requires.

The most honest conclusion is moderate. Human nature and recurrent problems of cooperation give us serious empirical reason to search for shared moral structures. Whether those structures are merely evolutionarily and culturally useful or objectively binding is an additional philosophical question.

Natural Law and the Euthyphro problem

Classical Natural Law in Aquinas does not simply mean 'God commanded it, therefore it is good'. Aquinas connects natural law with practical reason and the basic principle that good is to be done and pursued and evil avoided. Human beings are meant to apprehend moral precepts as rational agents, not merely as obedient recipients of commands.

This matters because of the ancient Euthyphro problem: is the good good because God commands it, or does God command it because it is good? If morality is merely the product of sheer will, arbitrariness threatens. If goodness exists independently of will, an account of its status is needed. Theistic theories offer sophisticated responses, but the dilemma should not be hidden behind authority.

For THY-REALITY another practical consequence follows: even if Natural Law is understood theistically, public moral argument cannot end with 'my tradition says so'. If a norm is to bind everyone, reasons must be capable of rational presentation to people outside that tradition as well.

Hard cases show whether a principle is really a principle

The moral minimum is easiest in obvious cases. Its value is tested when goods conflict. Self-defence places the life of the attacked against the life of the aggressor. Parenthood places a child's developing autonomy alongside an adult's duty of protection. Quarantine or emergency action may restrict freedom because of risk to others. Property rights may collide with an immediate threat to life.

Such cases do not show that principles are unreal. They show that a moral minimum needs procedural safeguards: necessity, proportionality, the least invasive means, demonstrable danger, a possibility of challenge, time limits and accountability for the actor using coercion.

This is precisely where modern systems deserve the strongest skepticism. Institutions are tempted to declare their own exception necessary and then turn necessity into a permanent mandate. If a restriction is genuinely justified, it should survive evidentiary audit after the political panic has passed.

The moral minimum as a test of power and of ourselves

Before a person or institution intrudes on another, several basic questions can be asked. Is there concrete and demonstrable harm? Is the affected person capable of and informed in consenting? Was the decision obtained through truth or manipulation? Does the rule apply equally to the ruler and ordinary person? Is the intrusion proportionate and reversible if it proves mistaken? Who bears responsibility for the damage?

These questions are not a mathematical algorithm of morality. They can conflict and they do not solve every dilemma. But they have one major virtue: they force power to translate its demand from the language of authority into the language of reasons. They do the same to the individual who wants to present private interest as a universal principle.

The moral minimum is therefore not a new dogma. It is a threshold below which talk of freedom loses meaning. If I may harm, deceive, coerce or take the product of another person's work merely because I possess more power or the correct stamp, then we are not living by morality but by hierarchy. Natural Law has value only if it applies to the person invoking it — especially when that person holds power.