Theories of ethics: consequences, duties and virtues

Ethics asks how we ought to live and act. Most people already hold moral views, that cruelty is wrong or promises should be kept, but moral philosophy tries to find the principles behind those views and to resolve cases where they conflict.

Three families of theories dominate Western moral philosophy. One judges actions by their outcomes, one by whether they follow moral rules, and one by the character they express.

Consequentialism holds that the right action is the one that produces the best consequences. Its best-known form, utilitarianism, developed by Jeremy Bentham and John Stuart Mill, says we should act to produce the greatest overall happiness or wellbeing, counting everyone's interests equally.

Utilitarianism has been a powerful force for reform. Bentham argued against the harsh treatment of animals and for legal reforms, and Mill championed women's rights. Its critics point out that it seems to permit terrible acts, such as punishing an innocent person, if doing so would produce better overall results.

Deontology, from the Greek word for duty, holds that some actions are right or wrong in themselves, regardless of consequences. The most influential deontologist, Immanuel Kant, argued that morality is based on reason and that we should act only on principles we could will to become universal laws.

Kant also said we must always treat people as ends in themselves, never merely as means. This captures the widespread intuition that people have rights that cannot be traded away for the greater good. Critics ask what to do when duties conflict, and whether it can really be wrong to lie to a murderer asking where your friend is hiding, as Kant notoriously claimed.

Virtue ethics, rooted in Aristotle, shifts the focus from actions to character. Instead of asking which rule to follow, it asks what a good person would do and how we become such a person.

Aristotle saw virtues such as courage, generosity and honesty as a mean between extremes: courage lies between cowardice and recklessness. Virtues are developed through practice, and the goal is eudaimonia, often translated as flourishing. Critics argue that virtue ethics gives little concrete guidance in hard cases, while supporters reply that real moral life depends on practical wisdom more than formulas.

• Should you lie to spare someone's feelings? A consequentialist weighs the harms and benefits; a deontologist sees a duty not to lie; a virtue ethicist asks what honesty and kindness together require.
• Consequentialism explains why outcomes matter but can threaten individual rights.
• Deontology protects rights and dignity but can seem rigid when rules clash.
• Virtue ethics captures moral character and growth but can be vague about specific decisions.

Other approaches add important perspectives. Care ethics, developed by thinkers such as Carol Gilligan and Nel Noddings, emphasises relationships, responsibility and attention to particular people rather than abstract principles. Social contract theories ground morality in rules that rational people would agree to for mutual benefit.

Traditions outside the West offer their own frameworks. Confucian ethics centres on cultivating virtue through relationships and ritual, and Buddhist ethics emphasises compassion and reducing suffering. In practice, many philosophers think each theory captures part of the truth, and good moral reasoning draws on all of them.