upgrade
upgrade

🥸Ethics

Moral Philosophers

Study smarter with Fiveable

Get study guides, practice questions, and cheatsheets for all your subjects. Join 500,000+ students with a 96% pass rate.

Get Started

Why This Matters

When you encounter an ethics question on your exam, you're not just being asked to recall who said what—you're being tested on your ability to distinguish between fundamentally different approaches to moral reasoning. Each philosopher represents a distinct answer to the question: What makes an action right or wrong? Some say it's the consequences, others say it's the intention, and still others argue it's about the kind of person you become. Understanding these frameworks lets you analyze any ethical dilemma from multiple angles.

The philosophers in this guide fall into recognizable camps: consequentialists who judge actions by their outcomes, deontologists who focus on duties and rules, virtue ethicists who emphasize character, and critics who challenge the entire enterprise. Don't just memorize names and dates—know which theoretical tradition each thinker belongs to and how their ideas respond to or critique other approaches. That's what separates a strong exam response from a mediocre one.


Virtue Ethics: Character Over Rules

Virtue ethicists argue that morality isn't primarily about following rules or calculating outcomes—it's about becoming a certain kind of person. The central question shifts from "What should I do?" to "What kind of person should I be?"

Aristotle

  • Virtue ethics founder—argued that good character, developed through habit and practice, is the foundation of moral life
  • Golden Mean describes virtue as the balance between excess and deficiency (courage lies between recklessness and cowardice)
  • Eudaimonia (flourishing or well-being) is the ultimate human goal, achieved only through living virtuously over a complete life

Plato

  • Theory of Forms posits that abstract ideals like Justice and Goodness exist independently of the physical world and serve as standards for moral judgment
  • Tripartite soul divides the psyche into reason, spirit, and appetite—ethical living requires reason to govern the other parts
  • Philosopher-king concept argues that only those who understand the Forms (true philosophers) are fit to rule justly

Thomas Aquinas

  • Natural law theory synthesizes Aristotelian virtue ethics with Christian theology, arguing that moral truths are discoverable through human reason
  • Divine law complements but doesn't replace natural law—both point toward the same moral truths
  • Theological virtues (faith, hope, charity) supplement the classical cardinal virtues, connecting ethics to spiritual salvation

Compare: Aristotle vs. Aquinas—both emphasize virtue and reason, but Aquinas adds a theological dimension, grounding natural law in divine creation. If an FRQ asks about secular versus religious ethics, this contrast is essential.


Deontological Ethics: Duty and Moral Law

Deontologists hold that certain actions are inherently right or wrong, regardless of their consequences. The rightness of an action depends on whether it conforms to moral rules or duties.

Immanuel Kant

  • Categorical Imperative provides the supreme principle of morality: act only according to rules you could will to be universal laws
  • Duty-based motivation is essential—an action has moral worth only when performed because it's right, not for personal benefit or emotional satisfaction
  • Autonomy and dignity ground Kant's ethics; rational beings must never be treated merely as means to an end

Compare: Kant vs. Mill—Kant says consequences are morally irrelevant; what matters is whether you acted from duty according to universalizable principles. Mill says consequences are all that matter. This is the classic deontology vs. consequentialism debate—expect it on exams.


Consequentialism: Outcomes Matter Most

Consequentialists evaluate actions solely by their results. An action is right if it produces good outcomes; wrong if it produces bad ones. The challenge lies in defining "good outcomes" and measuring them.

Jeremy Bentham

  • Classical utilitarianism defines the right action as whatever produces the greatest happiness for the greatest number
  • Hedonic calculus attempts to quantify pleasure and pain using factors like intensity, duration, certainty, and extent
  • Social reform was Bentham's practical aim—he applied utilitarian reasoning to advocate for legal and institutional changes

John Stuart Mill

  • Qualitative utilitarianism distinguishes between higher pleasures (intellectual, aesthetic) and lower pleasures (bodily), arguing that quality matters, not just quantity
  • Harm principle limits government interference to preventing harm to others—your liberty ends where another's begins
  • Rule utilitarianism (implicit in Mill) suggests we should follow rules that generally maximize happiness rather than calculating each individual act

Peter Singer

  • Effective altruism applies utilitarian logic to charitable giving—we're morally obligated to help others when we can do so at minimal cost to ourselves
  • Anti-speciesism extends equal consideration of interests to animals, arguing that species membership alone doesn't justify differential treatment
  • Global poverty arguments hold that affluent individuals have strong moral duties to alleviate suffering worldwide

Compare: Bentham vs. Mill—both are utilitarians, but Bentham treats all pleasures as equal while Mill introduces a hierarchy. Mill's distinction addresses the "pushpin is as good as poetry" objection. Know this refinement for essay questions on utilitarianism's development.


Justice and Social Contract Theory

Social contract theorists ask: What principles would rational people agree to for organizing society? This approach grounds political morality in hypothetical agreement rather than divine command or natural law.

John Rawls

  • Original position is a thought experiment where rational agents choose principles of justice from behind a "veil of ignorance" about their own place in society
  • Two principles of justice emerge: equal basic liberties for all, and social/economic inequalities permitted only if they benefit the least advantaged
  • Difference principle justifies inequality only when it improves conditions for the worst-off members of society

Compare: Rawls vs. Utilitarian Justice—utilitarians might sacrifice minority interests for majority benefit; Rawls explicitly protects the least advantaged. This distinction matters for questions about distributive justice and fairness.


Critics and Challengers

Some philosophers don't fit neatly into the major traditions because their primary contribution is challenging conventional moral thinking. They force us to question assumptions others take for granted.

David Hume

  • Moral sentimentalism argues that ethics originates in human emotions and sympathies, not pure reason
  • Is-ought problem (Hume's guillotine) identifies the logical gap between descriptive facts and normative prescriptions—you can't derive "should" from "is"
  • Social conventions and shared sentiments, not abstract reasoning, explain how moral norms actually develop and function

Friedrich Nietzsche

  • Master-slave morality distinction critiques traditional ethics as the revenge of the weak against the strong, inverting natural values
  • Übermensch (Overman) represents the ideal of someone who creates their own values rather than accepting inherited moral frameworks
  • Life affirmation opposes nihilism and asceticism—Nietzsche celebrates strength, creativity, and embracing existence fully

Compare: Hume vs. Kant—Hume says reason is "slave of the passions" and morality stems from sentiment; Kant insists morality must be grounded in pure practical reason alone. This is the rationalism vs. sentimentalism debate in ethics.


Quick Reference Table

ConceptBest Examples
Virtue EthicsAristotle, Plato, Aquinas
Deontological EthicsKant
Consequentialism/UtilitarianismBentham, Mill, Singer
Social Contract TheoryRawls
Moral SentimentalismHume
Critique of Traditional MoralityNietzsche
Natural Law TheoryAquinas
Animal EthicsSinger

Self-Check Questions

  1. Both Aristotle and Aquinas emphasize virtue, but what key element does Aquinas add that distinguishes his approach from purely secular virtue ethics?

  2. Explain how Mill's utilitarianism differs from Bentham's. What problem was Mill trying to solve with his distinction between higher and lower pleasures?

  3. If an FRQ presents a scenario where lying would produce the best overall outcome, how would Kant and Mill each evaluate the action? What specific concepts would each invoke?

  4. Compare Rawls's difference principle to a utilitarian approach to distributive justice. Under what circumstances might they recommend different policies?

  5. Both Hume and Nietzsche challenge traditional moral philosophy, but from different angles. What does each thinker identify as the source of our moral beliefs, and why does each consider this problematic?