Exploring the Interplay Between Duties and Rights in Liberal Thought

Rights and duties are not separate compartments of political life. They are deeply intertwined, and the precise nature of that link has occupied liberal thinkers for over two centuries. When you claim a right to free speech, someone somewhere carries a duty not to silence you. When the Constitution grants you the right to education, a corresponding duty falls on parents and the state. But which comes first? Does a right generate a duty, or does a duty give birth to a right? Liberal theory does not speak with one voice here. Instead, it offers several competing answers, each illuminating a different facet of how a just society holds together. This post walks through four of the most influential positions and shows what is at stake in their disagreement.

Why the link between duties and rights matters 🔗

Before diving into the theories, it helps to see why this is more than an academic puzzle. The relationship between rights and duties shapes how we design constitutions, how courts reason, and how citizens understand their place in a political community. The Indian Constitution captures this neatly: the Supreme Court has repeatedly treated fundamental rights and fundamental duties as complementary, two sides of the same coin. The right to a clean environment under Article 21 sits alongside the duty to protect the environment under Article 51A(g). The right to education under Article 21A is mirrored by the duty placed on parents under Article 51A(k).

This correlation is not accidental. It reflects a long-standing intuition that where there is a right, there is a duty. But intuition is not analysis. To understand why rights and duties correspond, and what each one fundamentally is, we have to turn to the theorists who tried to define the very concept of a right.

Interest Theory: rights as protected benefits 🔗

The first major position is usually called Interest Theory (also known as Benefit Theory). Its roots lie with Jeremy Bentham, the founder of utilitarianism, and it has been carried forward by thinkers like John Stuart Mill, Rudolf von Ihering, and more recently Joseph Raz and Matthew Kramer.

The core claim is straightforward. To have a right is to be the beneficiary of someone else’s duty. On Bentham’s account, you have a right to vote if someone is legally required to provide you with the opportunity to vote and to count your ballot. The right exists because a duty exists that serves your interest. Strip away the duty, and the right vanishes.

How Raz refined the idea 🔗

The most influential modern formulation comes from Joseph Raz. According to his version, X has a right if an aspect of X’s well-being is a sufficient reason for holding another person to be under a duty. Notice the direction of explanation here. The interest comes first. Because your interest is important enough, the law (or morality) recognises it by imposing a duty on others. The right is essentially that protected interest, with the duty acting as its guard.

This view has obvious appeal. It explains why we give rights to people who cannot assert them. Infants, people in comas, and those with severe cognitive impairments clearly have interests worth protecting, even if they cannot personally demand anything. Interest Theory accommodates them easily because what matters is the benefit, not the ability to claim it.

Choice Theory: rights as control over others 🔗

The rival camp is Choice Theory (also called Will Theory), most powerfully developed by the British legal philosopher H. L. A. Hart. Interestingly, Hart credited Immanuel Kant as the inspiration for his emphasis on human freedom, treating liberty as the most basic right and the law’s purpose as enabling free expression of the will.

Hart asked a sharp question: what makes a right distinctive? If having a right just means being the beneficiary of a duty, then the word “right” adds nothing new. We could simply talk about duties and never mention rights at all. Hart found this unacceptable. His answer was that rights give their holders a measure of normative control, making them “small-scale sovereigns” over a certain domain.

The power to claim or waive 🔗

What does this control look like in practice? On Hart’s view, having a right means you can choose whether to insist that someone perform their duty to you or to release them from it. If you have a right, the extent of another person’s freedom depends on your choices. You can claim the duty’s performance, or you can waive it. The person bound by the duty cannot waive it themselves; they can only perform it. That asymmetry, Hart argued, is exactly what rights add to a system that already has duties.

Consider a debt. If I owe you money, you have a right to repayment. You may demand the money, or you may forgive the debt entirely. That power of decision belongs to you, not to me. For Hart, your control over my duty is the essence of your right.

The famous weakness 🔗

Choice Theory has a notorious problem. If a right is the power to claim or waive a duty, then beings who cannot make such choices cannot have rights. This implies that infants and those who cannot understand how to claim or waive a right would, like animals, lack rights. Most people find this conclusion troubling. Defenders respond that guardians and trustees exercise the relevant choices on behalf of those who cannot. Hart himself later softened his position, conceding that for children, such powers and correlative obligations may be exercised on their behalf by appointed representatives.

Here lies the deep contrast between the two theories. For Interest Theory, the duty serves your benefit. For Choice Theory, the duty falls under your command. One puts well-being at the centre; the other puts the will.

Kantian autonomy: duty as the ground of freedom 🔗

The third perspective shifts the focus entirely. For Immanuel Kant, the relationship between duty and rights is rooted not in interests or even in choices about specific duties, but in the moral structure of a rational being. The key concept is autonomy.

In Kant’s moral philosophy, autonomy means self-legislation. A free will is not one that does whatever it pleases; it is one that gives itself the moral law and then obeys it. As described in his Groundwork of the Metaphysics of Morals, autonomy is moral freedom, the ability of the will to govern itself by following universal moral principles. Duty, on this view, is not an external imposition that limits freedom. Duty is the very expression of a rational being’s freedom. To act from duty is to act autonomously.

From moral duty to political right 🔗

This idea has a direct political payoff. Kant argued that the protection of autonomy at the political level is captured in the principle of right: each person has a right to any action that can coexist with the freedom of every other person under a universal law. Your right to act freely is bounded by everyone else’s equal right to do the same. Rights and duties are reconciled through a single formula of mutual, universalisable freedom.

The connection between Kant’s ethics and liberal politics runs even deeper. Kant’s idea of autonomy can be grasped by analogy with political freedom: a state is free when its citizens are bound only by laws of their own making. The legitimacy of law, like the bindingness of morality, comes from within, from the will of those who must obey it. A citizen who follows a law they helped create is not unfree; they are autonomous in the political sphere, just as the moral agent who follows self-given law is autonomous in the ethical sphere.

Kant also drew a careful line between two kinds of duty. He held that right concerns outer freedom and is coercible, while virtue concerns inner freedom and the proper motive behind dutiful action. The duties of right can be legally enforced because they govern external actions among people. The duties of virtue cannot be coerced, because they concern the inner disposition from which we act. This distinction matters: it explains why the state can compel you to keep a contract but cannot compel you to be generous.

Rawls: separating natural duties from obligations 🔗

The fourth perspective comes from John Rawls, whose 1971 work A Theory of Justice reshaped twentieth-century liberal thought. Rawls offered one of the most precise treatments of duties on individuals, and his central move was to split them into two distinct categories.

Natural duties 🔗

The first category is what Rawls called natural duties. These are binding on individuals without any prior voluntary act, and their content is not defined by the rules of institutions. You did not sign up for them, yet they bind you simply because you are a person dealing with other persons. Rawls lists several: the duty of mutual aid, the duty of mutual respect, the duty not to harm or injure others, and the duty not to cause unnecessary suffering. The most important of these, from the standpoint of his theory, is the natural duty of justice, which requires us to support and comply with just institutions.

Crucially, natural duties apply to us without us having performed any voluntary act and are not necessarily connected to institutions. You owe respect to a stranger you have never met and never agreed to interact with. The duty is “natural” precisely because it does not depend on consent or membership.

Obligations and the principle of fairness 🔗

The second category is obligations, and these work very differently. Obligations arise only when you have voluntarily done something to incur them. They are governed by what Rawls calls the principle of fairness. Under this principle, a person is required to do their part as defined by an institution’s rules when two conditions hold: the institution is just, and the person has voluntarily accepted its benefits or taken advantage of its opportunities.

The guiding idea is fairness in cooperation. We are not to gain from the labour of others in a just scheme without doing our own fair share. Importantly, an obligation cannot exist toward an unjust institution, regardless of consent. You cannot be fairly bound to support an arrangement that violates the principles of justice, even if you once agreed to it.

Why does this distinction matter for rights? Because it clarifies how a just society generates claims on its members. Some claims, the natural duties, ground rights we hold against everyone simply as human beings. Others, the obligations, ground rights that arise from particular cooperative arrangements we have joined. Rawls thus separates the universal moral floor from the specific commitments we voluntarily build on top of it.

Bringing the four views together 🔗

Each theory answers our opening question differently. Interest Theory says the interest grounds the duty, and the right is the protected interest. Choice Theory says the right is control over another’s duty, with the will at the centre. Kant says duty and right both flow from autonomy, reconciled through the principle of universal freedom. Rawls says we must distinguish duties we never chose from obligations we voluntarily took on, with each grounding different kinds of claims.

These are not merely abstract disputes. They surface in real constitutional debates. When Indian courts read the right to a clean environment together with the duty to protect it, they are working with an interest-based logic: the citizen’s interest in a healthy environment grounds duties on the state and on fellow citizens. When we debate whether non-justiciable duties under Article 51A should remain voluntary moral commitments or become enforceable obligations, we are essentially navigating the territory Rawls mapped between natural duties and obligations. And when liberal democracies justify coercive law by appeal to laws citizens give themselves, they are drawing, knowingly or not, on the Kantian picture of autonomy.

The lasting lesson is that rights are never free-floating. They are stitched into a web of duties, and the way we understand that stitching shapes the kind of political community we build. A society that sees rights purely as protected interests will design its institutions differently from one that sees them as zones of individual sovereignty or as expressions of shared autonomy.

What do you think? If a right is meaningless without a corresponding duty, should fundamental duties in a constitution be made legally enforceable, or does their power lie precisely in being voluntary? And when you reflect on your own rights as a citizen, do you experience them more as protected interests, as Bentham would say, or as choices under your control, as Hart insisted?

References

1. https://superkalam.com/upsc-mains/notes/fundamental-duties-article-51-a-in-the-indian-constitution-upsc-polity-notes
2. https://thelegalquotient.com/jurisprudence/theories-of-legal-rights/2278/
3. https://plato.stanford.edu/entries/legal-rights/
4. https://carneades.sites.pomona.edu/2010-Law/nts-0310.shtml
5. https://academic.oup.com/ojls/article/38/3/430/4958699
6. https://ijsdr.org/papers/IJSDR2410068.pdf
7. https://iep.utm.edu/autonomy/
8. https://plato.stanford.edu/entries/kant-moral/
9. https://plato.stanford.edu/entries/kant-social-political/
10. https://www.cambridge.org/core/books/abs/cambridge-rawls-lexicon/natural-duties/F8F3D51C8B0C74877F54FCC0787C12FA
11. https://politicalnotmetaphysical.wordpress.com/2016/02/17/readers-guide-rawls-a-theory-of-justice-ch-2-%C2%A718-19-principles-for-individuals/
12. https://politicalnotmetaphysical.wordpress.com/tag/natural-duty/
13. https://www.coursehero.com/lit/A-Theory-of-Justice/part-2-chapter-6-summary/