Source Count: 14 | Weighted Score: 26 | Source Confidence: [3/5] | Primary Tier: 1 | Last Updated: March 12, 2026
Keywords: promise, contract, obligation, trust, fidelity, promissory obligation, Scanlon, Fried, Hume, convention, social contract, consent, breach, reliance, expectation, performative, speech act, commitment, pacta sunt servanda
Category Tags: ethics, political philosophy, philosophy of language, law, social theory
Cross-References: ZE_1_07 — Social Contract · ZE_5_01 — Ethics of Consent · ZE_4_12 — Lying and Deception · ZE_1_03 — Metaethics · ZE_4_03 — Business Ethics

QUICK SUMMARY

Promise-keeping is among the most fundamental moral obligations — yet its philosophical basis is surprisingly elusive. Why does uttering certain words ("I promise") create a binding moral obligation? The question has generated three major lines of response. Charles Fried (Contract as Promise, 1981) defended the autonomy-based view: a promise is an exercise of moral autonomy — the promisor voluntarily assumes an obligation, and the moral force of the promise derives from respect for persons and their capacity for self-binding commitment. T. M. Scanlon (What We Owe to Each Other, 1998) developed the expectations-based view: the wrongness of promise-breaking lies in the manipulation of reasonable expectations — when I promise, I deliberately create an expectation in you and it would be wrong to knowingly disappoint that expectation without adequate justification. David Hume (A Treatise of Human Nature, 1740) offered the convention-based view: promises are social conventions that serve mutual advantage — they are "artificial virtues" whose moral force derives from their social utility rather than from any natural moral fact. The ethics of promise intersects with contract law (which enforces agreements through legal sanctions), social contract theory (which uses the metaphor of promise to ground political obligation), and everyday morality (where promise-breaking is one of the most commonly recognized wrongs). Modern debates address whether promises can be overridden by competing obligations, whether promises to oneself are genuine promises, and whether the digital age — with its click-through agreements and terms of service — has transformed the nature of consent and commitment.

1. VERIFIED CLAIMS (Tier 1 — Peer-Reviewed / Experimentally Confirmed)

1.1 The Autonomy-Based Theory

• Fried (Contract as Promise, 1981):
• A promise is "a moral act whereby the promisor creates in the promisee a right to the promised performance"
• The moral basis: respect for autonomy — the promisor exercises their capacity for self-binding commitment. Just as one's word should mean something, the deliberate invocation of the promissory convention creates a genuine obligation
• Contract is promise: Fried argued that the law of contract should be understood as the legal enforcement of voluntary promises — the moral foundation of contract law is promissory obligation, not mere efficiency or reliance
• Critics (Atiyah, 1981; Craswell, 1989): argued that not all contracts are promise-like — many are bargains, risk-allocations, or reliance-based arrangements that do not fit the promissory model. Fried's theory is too narrow to account for the full range of contractual obligations

1.2 The Expectations-Based Theory

• Scanlon (What We Owe to Each Other, 1998, ch. 7):
• The wrongness of breaking a promise is not derived from a mysterious moral power to create obligations through words, but from the principle of fidelity to expectations: if I deliberately create an expectation that I will do X, and you rely on that expectation, and I know this, then it would be wrong for me to disappoint your expectation without adequate reason
• This account is contractualist: the moral force of promises derives from principles that no one could reasonably reject — and the principle of fidelity to deliberately created expectations is one such principle
• Advantage: Scanlon's account explains why promises create obligations without invoking any special moral magic — the obligation flows from general principles about how we ought to treat one another
• Criticism: some argue Scanlon's account is too thin — it makes promise-breaking wrong only because of the harm to the promisee's expectations, not because of any intrinsic wrong in failing to keep one's word. Kimel (From Promise to Contract, 2003) responded that promises are also valuable for the intimate, trust-based relationships they express and sustain

1.3 The Convention-Based Theory

• Hume (A Treatise of Human Nature, Book III, Part II, §5, 1740):
• Promises are not "natural" acts but conventional ones — they depend on the existence of a social practice of promising. Without the convention, the mere utterance of words would create no obligation
• The moral force of promises derives from the social utility of the convention — a society in which promises are kept is vastly better for everyone than one in which they are not. Each individual promise derives its moral force from the ongoing benefit of maintaining the convention
• Modern refinement (Rawls, "Two Concepts of Rules," 1955): distinguished between justifying a practice (utilitarian reasons — promising is useful) and justifying actions within a practice (you must keep this promise because the practice requires it). Once the practice exists, individual obligations are not reducible to case-by-case utility calculations

1.4 Speech Act Theory

• Austin (How to Do Things with Words, 1962) and Searle (Speech Acts, 1969): analyzed promising as a performative speech act — the utterance "I promise" does not describe a pre-existing state of affairs but creates an obligation through the act of speaking
• Searle's conditions for a valid promise: (a) the speaker intends to do what they promise, (b) the hearer understands the promise, (c) the promise creates an obligation that would not otherwise exist, (d) the speaker is sincere
• This linguistic analysis clarifies the mechanism of promising but does not by itself explain its moral force — that requires the philosophical theories above

2. CREDIBLE CLAIMS (Tier 2 — Supported by Multiple Scholars / Strong Circumstantial Evidence)

2.1 Overriding Promises

• Can moral obligations override promises? When is promise-breaking justified?
• Ross (The Right and the Good, 1930): fidelity (promise-keeping) is a prima facie duty — it generates a real moral obligation that can nevertheless be overridden by stronger moral considerations (preventing serious harm, justice, beneficence)
• Example: if I promise to meet you for lunch but encounter a serious car accident and must render aid, my duty of beneficence overrides my promise. The promise is not canceled — it generates a residual obligation (I should apologize, explain, and reschedule)
• Limits: trivial convenience does not override promises; the competing obligation must be genuinely compelling. The chronic promise-breaker who always has "more important things to do" undermines trust and social cooperation

2.2 Contract Law and Moral Promise

• The relationship between moral promises and legal contracts is complex:
• Pacta sunt servanda ("agreements must be kept"): the foundational principle of contract law in both common-law and civil-law traditions
• Consideration (common law): a contract requires "consideration" — something of value exchanged. Not all promises are legally enforceable; only those supported by consideration. This creates a gap between moral promise (which may be gratuitous) and legal contract
• Reliance: some promises create legal obligations not through consideration but through promissory estoppel — if A promises B something, B reasonably relies on the promise to their detriment, and A revokes the promise, equity may enforce the promise to prevent injustice
• Unconscionability: even valid contracts may be voided if their terms are grossly unfair — recognizing that not all "agreements" represent genuine consent

2.3 Promising and Trust

• Baier (Trust and Antitrust, 1986): trust is essential to moral life and is built through the reliable keeping of commitments. Trust is not merely a psychological state but a moral relationship — to trust someone is to make oneself vulnerable on the basis of their commitment
• Promise-breaking damages trust — not merely between the parties but in the broader social fabric. Systematic promise-breaking corrodes the capacity for social cooperation, institutional functioning, and interpersonal intimacy
• Institutional trust: contracts, constitutions, and international agreements are promissory in nature — their effectiveness depends on the expectation that parties will honor their commitments. When institutions systematically break promises (broken treaties with Indigenous nations, violated international agreements), the damage extends beyond the specific breach to the credibility of the institutional order

3. SPECULATIVE CLAIMS (Tier 3 — Limited Evidence / Emerging Hypotheses)

3.1 Digital Consent and Click-Through Agreements

• Modern life is saturated with "agreements" that lack the features of genuine promises:
• Terms of Service: users routinely "agree" to thousands of words of legal text they have not read. Whether click-through consent constitutes genuine promissory commitment is philosophically doubtful
• Radin (Boilerplate, 2013) argued that most consumer "contracts" are not genuine agreements but unilateral impositions by powerful parties — they lack the voluntariness, understanding, and reciprocity that genuine promises require
• Whether new forms of digital consent — and the gap between nominal and genuine agreement — require rethinking the ethics of promise remains an open question

3.2 Promises to the Dead

• Can we have obligations to fulfill promises made to people who have subsequently died? Intuitively many people feel such obligations are binding, but the promisee can no longer be harmed by noncompliance. This tests the theoretical foundations: autonomy-based theories suggest the obligation survives (the promisor's commitment was genuine); expectations-based theories have difficulty (the deceased has no expectations). The question remains philosophically contested

4. DUBIOUS CLAIMS (Tier 4 — Fringe / Not Supported by Evidence)

4.1 All Promises Are Absolute

• The claim that promises can never be overridden is untenable — virtually all moral theorists recognize that sufficiently serious competing obligations can justify promise-breaking. Treating promises as absolute ignores the complexity of moral life and the possibility of genuine moral conflict

4.2 Promises Are Meaningless Social Conventions

• Moral nihilism about promises — the view that promises have no binding force and are merely strategic communications — cannot account for the deep and universal moral experience of obligation, trust-violation, and betrayal that accompanies promise-breaking across cultures

COUNTER-ARGUMENTS

• Competing justification theories: Why promises bind is explained by three major competing theories — Charles Fried (Contract as Promise, 1981) grounds obligation in autonomy and the moral significance of undertaken commitments; T.M. Scanlon (What We Owe to Each Other, 1998) grounds it in the expectations created in others; and the Humean convention account treats promise-keeping as a social practice sustained by mutual advantage. P.S. Atiyah (Promises, Morals, and Law, 1981) criticized Fried's autonomy account as failing to explain why the state should enforce private commitments
• Prima facie obligation: W.D. Ross treated promise-keeping as a prima facie duty that can be overridden by other moral considerations (preventing harm, justice) — the question of when and how promise-breaking is justified remains a standard test case in ethical theory

IMAGES

BIBLIOGRAPHY

1. Atiyah, P | 1981 | ∅ | Promises, Morals, and Law | ∅ | ∅ | S | ∅ | doi:10.1017/s0008197300108827 | ∅ | ∅ | Oxford University Press
2. Austin, J | 1975 | ∅ | How to Do Things with Words | ∅ | ∅ | L. | 2nd | doi:10.1093/acprof:oso/9780198245537.001.0001 | ∅ | ∅ | Harvard University Press, [1962]
3. Baier, Annette | 1986 | "Trust and Antitrust" | Ethics | ∅ | 2::231–260 | 96, no | ∅ | doi:10.1086/292745 | ∅ | ∅ | ∅
4. Craswell, Richard | 1989 | "Contract Law, Default Rules, and the Philosophy of Promising" | Michigan Law Review | ∅ | 3::489–529 | 88, no | ∅ | doi:10.2307/1289110 | ∅ | ∅ | ∅
5. Fried, Charles. . | 2015 | ∅ | Contract as Promise: A Theory of Contractual Obligation | ∅ | ∅ | Oxford University Press, [1981] | 2nd | doi:10.1093/acprof:oso/9780190240158.003.0002 | ∅ | ∅ | ∅
6. Hume, David | 1978 | ∅ | A Treatise of Human Nature | ∅ | ∅ | Ed | 2nd | isbn:9780344443756 | ∅ | ∅ | L; A; Selby-Bigge and P; H; Nidditch; Clarendon, [1739 40]
7. Kimel, Dori | 2003 | ∅ | From Promise to Contract: Towards a Liberal Theory of Contract | ∅ | ∅ | Hart | ∅ | ∅ | ∅ | ∅ | ∅
8. Radin, Margaret Jane | 2013 | ∅ | Boilerplate: The Fine Print, Vanishing Rights, and the Rule of Law | ∅ | ∅ | Princeton University Press | ∅ | ∅ | ∅ | ∅ | ∅
9. Rawls, John | 1955 | "Two Concepts of Rules" | Philosophical Review | ∅ | 1::3–32 | 64, no | ∅ | ∅ | ∅ | ∅ | ∅
10. Ross, W | 2002 | ∅ | The Right and the Good | ∅ | ∅ | D. . [Ed | ∅ | ∅ | ∅ | ∅ | Philip Stratton-Lake.] Oxford University Press, [1930]
11. Scanlon, T | 1998 | ∅ | What We Owe to Each Other | ∅ | ∅ | M | ∅ | ∅ | ∅ | ∅ | Harvard University Press
12. Searle, John R. | 1969 | ∅ | Speech Acts: An Essay in the Philosophy of Language | ∅ | ∅ | Cambridge University Press | ∅ | ∅ | ∅ | ∅ | ∅
13. Shiffrin, Seana Valentine | 2007 | "The Divergence of Contract and Promise" | Harvard Law Review | ∅ | 3::708–753 | 120, no | ∅ | ∅ | ∅ | ∅ | ∅
14. Owens, David | 2012 | ∅ | Shaping the Normative Landscape | ∅ | ∅ | Oxford University Press | ∅ | ∅ | ∅ | ∅ | ∅

CROSS-REFERENCE INDEX

• Social Contract → ZE_1_07 — Social Contract
• Ethics of Consent → ZE_5_01 — Ethics of Consent
• Lying and Deception → ZE_4_12 — Lying and Deception
• Business Ethics → ZE_4_03 — Business Ethics
• Metaethics → ZE_1_03 — Metaethics
• Political Philosophy → P_2_06 — Political Philosophy

Last updated: March 12, 2026