Some moral philosophers argue that spending some of your resources – without significantly affecting your financial stability – to help other people who badly suffer is our moral duty and not merely a matter of charity. Justify this claim by explaining the distinction between duty and charity.

The claim and where it comes from

This is Peter Singer's argument, made in "Famine, Affluence and Morality" (1972). Its structure is short and hard to escape:

• Suffering and death from lack of food, shelter and medical care are bad.
• If it is in our power to prevent something bad from happening, without sacrificing anything of comparable moral importance, we ought morally to do it.
• Absolute poverty is preventable at a cost that is not comparably important to an affluent person.
• Therefore we ought to prevent it — and failing to do so is wrong, not merely less than admirable.

The drowning child

Singer's illustration does the work. If you pass a shallow pond where a child is drowning, you must wade in even though it ruins your clothes. Nobody thinks this is optional generosity, and nobody thinks the cost of the clothes is a defence. Singer's challenge is that distance and the presence of other bystanders are the only differences between that case and a preventable death abroad — and neither is a morally relevant difference. Our note on Peter Singer develops this.

The distinction the question asks for

• Duty (obligation) is owed. It is claimable by the beneficiary, its breach warrants blame, and it is not discharged by inclination. Kant's perfect duties are of this kind.
• Charity (supererogation) is above and beyond. It is praiseworthy to do, not blameworthy to omit, and the giver chooses recipient, amount and timing.

The moral consequence of reclassification is the whole point. Under charity, the affluent person who gives nothing is simply not generous. Under duty, the same person has wronged someone. The beneficiary moves from grateful recipient to holder of a claim.

The case for treating it as duty

• Capacity generates obligation. We already accept this in rescue duties, in the duty to report a crime, and in the special obligations of doctors and public servants.
• Omission can be culpable. The law itself recognises this where a duty to act exists; morality recognises it more broadly.
• Charity leaves the poor dependent on mood. Rights-based welfare — the entitlement approach, the NFSA, MGNREGA — exists precisely because dignity requires claims rather than favours.
• Indian traditions converge. Dana in the Gita is enjoined as duty when given to a fit recipient without expectation, and zakat is obligatory rather than voluntary — both treat giving as owed, not optional.

Objections, and honest replies

• Demandingness. Taken strictly, the principle requires giving until further giving costs something comparable, which is close to impoverishing oneself. Singer's moderate version — the qualifier in this question, "without significantly affecting your financial stability" — is the defensible one.
• Causation. I did not cause the famine. True, but the drowning-child case shows that the duty to rescue does not depend on having caused the peril.
• Effectiveness. Aid is sometimes wasted. This argues for giving well, not for not giving.
• Special obligations. Family and community come first. Granted — but this limits the scope of the duty, it does not dissolve it.

Conclusion

The claim is justified in its moderate form. Where the cost to me is trivial and the benefit to another is survival, the asymmetry is so extreme that calling my response "charity" understates what is at stake. The strongest version of the argument is not that we must give everything, but that the language of charity lets us treat as optional something we already know is owed.