Ethics: An Introduction and Collection of Resources

This page contains an organized collection of links to beginner friendly videos, podcasts and articles on ethics. For a good comprehensive introduction to ethics, watch Justice: What’s the Right Thing To Do, a lecture course from Harvard which is available on Youtube, or read an introductory textbook such as The Elements of Moral Philosophy by James and Stuart Rachels or The Fundamentals of Ethics by Russ Shafer-Landau. If you’re totally new to ethics and want a quick introduction to the subject, try the following options:

For more resources on specific topics within ethics, simply choose a topic from the list below:

What is ethics/moral philosophy?

“The field of ethics (or moral philosophy) involves systematizing, defending, and recommending concepts of right and wrong behavior. Philosophers today usually divide ethical theories into three general subject areas: metaethics, normative ethics, and applied ethics. Metaethics investigates where our ethical principles come from, and what they mean. Are they merely social inventions? Do they involve more than expressions of our individual emotions? Metaethical answers to these questions focus on the issues of universal truths, the will of God, the role of reason in ethical judgments, and the meaning of ethical terms themselves. Normative ethics takes on a more practical task, which is to arrive at moral standards that regulate right and wrong conduct. This may involve articulating the good habits that we should acquire, the duties that we should follow, or the consequences of our behavior on others. Finally, applied ethics involves examining specific controversial issues, such as abortion, infanticide, animal rights, environmental concerns, homosexuality, capital punishment, or nuclear war.” – Excerpt from the Internet Encyclopedia of Philosophy article on Ethics by James Fieser.

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Thought Experiments

Phillipa Foot’s Trolley Dilemma

There is a runaway trolley barreling down the railway tracks. Ahead, on the tracks, there are five people tied up and unable to move. The trolley is headed straight for them. You are standing some distance off in the train yard, next to a lever. If you pull this lever, the trolley will switch to a different set of tracks. However, you notice that there is one person on the side track. You have two options:

  1. Do nothing, and the trolley kills the five people on the main track.
  2. Pull the lever, diverting the trolley onto the side track where it will kill one person.

Which is the most ethical choice?

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Singer’s Drowning Child

“On your way to work, you pass a small pond. On hot days, children sometimes play in the pond, which is only about knee-deep. The weather’s cool today, though, and the hour is early, so you are surprised to see a child splashing about in the pond. As you get closer, you see that it is a very young child, just a toddler, who is flailing about, unable to stay upright or walk out of the pond. You look for the parents or babysitter, but there is no one else around. The child is unable to keep his head above the water for more than a few seconds at a time. If you don’t wade in and pull him out, he seems likely to drown. Wading in is easy and safe, but you will ruin the new shoes you bought only a few days ago, and get your suit wet and muddy. By the time you hand the child over to someone responsible for him, and change your clothes, you’ll be late for work. What should you do? […]

UNICEF, Oxfam, and many other organizations are working to reduce poverty and provide clean water and basic health care, and these efforts are reducing the toll. If the relief organizations had more money, they could do more, and more lives would be saved.

Now think about your own situation. By donating a relatively small amount of money, you could save a child’s life. Maybe it takes more than the amount needed to buy a pair of shoes—but we all spend money on things we don’t really need, whether on drinks, meals out, clothing, movies, concerts, vacations, new cars, or house renovation. Is it possible that by choosing to spend your money on such things rather than contributing to an aid agency, you are leaving a child to die, a child you could have saved?” – Excerpt from The Life You Can Save: How to Do Your Part to End World Poverty by Peter Singer.

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Nozick’s Experience Machine

“[Nozick] has us imagine a machine developed by “super duper neuropsychologists” into which one could enter and have any sort of experience she desires. A person’s brain could be stimulated so she would think and feel that she was reading a book, writing a great novel, or climbing Mt.Everest. But all of the time the person would simply be floating in a tank with electrodes attached to her head. If one worries that she would get bored by a life of pleasant circumstances, there is nothing that disallows her from simply having problematic events programmed in to keep things interesting. As this is a thought experiment, and Nozick doesn’t want readers to be distracted by details that don’t force them to test their intuitions, we are to imagine that the machine is reliable, in fact unbreakable, so these would not be technical or trivial reasons to fail to enter. Nozick asks the reader if she would enter the machine.

Nozick thought we would not enter, concluding that people would follow his intuition that such programmed experiences are not real. He argued that people don’t merely want to experience certain actions, but that they want to actually do them. Nozick suspects that we wouldn’t enter the machine because we don’t merely wish to experience being famous, but we want to be certain types of people who do certain types of thing. For example, I don’t merely want to experience that I am a great novelist, I want to genuinely be a great novelist.” – Excerpt from the Internet Encyclopedia of Philosophy article on Robert Nozick: Political Philosophy by Dale Murray.

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Ethical Theories


“Upon reflection, it starts to seem as though everything we do is in order to bring about some consequence. What does it mean to bring about a consequence? Here is one way to look at it: Bringing about a consequence is a way of changing the world, in a small or a large way. I want the world to be thus-and-so, but it’s not currently thus-and-so, so I will perform this action to make it thus-and-so.

The point is that we often, maybe always, do things to bring about certain consequences. Why would you do anything if you didn’t think it was going to have some result? This has led some thinkers, such as John Stuart Mill, to reason, “All action is for the sake of some end, and rules of action, it seems natural to suppose, must take their whole character and colour from the end to which they are subservient.” If all of our actions are done for the sake of bringing about some consequence, and the consequences are ultimately what we care about, then it makes sense to judge actions, that is, to determine the moral status of actions, based on their consequences. This view is known as consequentialism: That the consequences of an action are all that matter in moral assessment.” – Excerpt from the 1000 Word Philosophy article: Introduction to Consequentialism by Shane Gronholz.

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Deontological Ethics

“In contrast to consequentialist theories, deontological theories judge the morality of choices by criteria different from the states of affairs those choices bring about. The most familiar forms of deontology, and also the forms presenting the greatest contrast to consequentialism, hold that some choices cannot be justified by their effects—that no matter how morally good their consequences, some choices are morally forbidden. On such familiar deontological accounts of morality, agents cannot make certain wrongful choices even if by doing so the number of those exact kinds of wrongful choices will be minimized (because other agents will be prevented from engaging in similar wrongful choices). For such deontologists, what makes a choice right is its conformity with a moral norm. Such norms are to be simply obeyed by each moral agent; such norm-keepings are not to be maximized by each agent. In this sense, for such deontologists, the Right is said to have priority over the Good. If an act is not in accord with the Right, it may not be undertaken, no matter the Good that it might produce (including even a Good consisting of acts in accordance with the Right).” – Excerpt from the Internet Encyclopedia of Philosophy article on Deontological Ethics by Larry Alexander and Michael Moore.

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Divine Command Theory

“Philosophers both past and present have sought to defend theories of ethics that are grounded in a theistic framework. Roughly, Divine Command Theory is the view that morality is somehow dependent upon God, and that moral obligation consists in obedience to God’s commands. Divine Command Theory includes the claim that morality is ultimately based on the commands or character of God, and that the morally right action is the one that God commands or requires. The specific content of these divine commands varies according to the particular religion and the particular views of the individual divine command theorist, but all versions of the theory hold in common the claim that morality and moral obligations ultimately depend on God.” – Excerpt from the Internet Encyclopedia of Philosophy article on Divine Command Theory by Michael W. Austin.

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“In philosophy, egoism is the theory that one’s self is, or should be, the motivation and the goal of one’s own action. Egoism has two variants, descriptive or normative. The descriptive (or positive) variant conceives egoism as a factual description of human affairs. That is, people are motivated by their own interests and desires, and they cannot be described otherwise. The normative variant proposes that people should be so motivated, regardless of what presently motivates their behavior. Altruism is the opposite of egoism. The term “egoism” derives from “ego,” the Latin term for “I” in English. Egoism should be distinguished from egotism, which means a psychological overvaluation of one’s own importance, or of one’s own activities.” Excerpt from the Internet Encyclopedia of Philosophy article on Egoism by Alexander Moseley

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Feminist Ethics

“Feminist Ethics is an attempt to revise, reformulate, or rethink traditional ethics to the extent it depreciates or devalues women’s moral experience. Among others, feminist philosopher Alison Jaggar faults traditional ethics for letting women down in five related ways. First, it shows less concern for women’s as opposed to men’s issues and interests. Second, traditional ethics views as trivial the moral issues that arise in the so-called private world, the realm in which women do housework and take care of children, the infirm, and the elderly. Third, it implies that, in general, women are not as morally mature or deep as men. Fourth, traditional ethics overrates culturally masculine traits like “independence, autonomy, intellect, will, wariness, hierarchy, domination, culture, transcendence, product, asceticism, war, and death,” while it underrates culturally feminine traits like “interdependence, community, connection, sharing, emotion, body, trust, absence of hierarchy, nature, immanence, process, joy, peace, and life.” Fifth, and finally, it favors “male” ways of moral reasoning that emphasize rules, rights, universality, and impartiality over “female” ways of moral reasoning that emphasize relationships, responsibilities, particularity, and partiality (Jaggar, “Feminist Ethics,” 1992).” – Excerpt from the Stanford Encyclopedia of Philosophy article on Feminist Ethics by Rosemary Tong and Nancy Williams.

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Moral Realism/Anti-Realism

“‘Happiness is good.’ ‘We shouldn’t punish innocents.’ ‘Generosity is a good character-trait.’ Ethical realists say that ethical claims such as these are objectively true: their truth does not depend on anyone’s particular opinions, beliefs, preferences, or characteristics. That is, realists believe that there are right answers in ethics. They reject relativism, according to which there are only non-objective ethical facts, and they reject nihilism, according to which there are no ethical facts (a theory sometimes called ‘error theory’), and maybe even no ethical assertions of any kind (a theory sometimes called ‘non-cognitivism’).” – Excerpt from the 1000 Word Philosophy article on Ethical Realism by Thomas Metcalf.

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“Moral relativism is the view that moral judgments are true or false only relative to some particular standpoint (for instance, that of a culture or a historical period) and that no standpoint is uniquely privileged over all others.  It has often been associated with other claims about morality: notably, the thesis that different cultures often exhibit radically different moral values; the denial that there are universal moral values shared by every human society; and the insistence that we should refrain from passing moral judgments on beliefs and practices characteristic of cultures other than our own.” – Excerpt from the Internet Encyclopedia of Philosophy article on Moral Relativism by Emrys Westacott.

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“Utilitarianism is one of the best known and most influential moral theories. Like other forms of consequentialism, its core idea is that whether actions are morally right or wrong depends on their effects. More specifically, the only effects of actions that are relevant are the good and bad results that they produce….

Utilitarians believe that the purpose of morality is to make life better by increasing the amount of good things (such as pleasure and happiness) in the world and decreasing the amount of bad things (such as pain and unhappiness). They reject moral codes or systems that consist of commands or taboos that are based on customs, traditions, or orders given by leaders or supernatural beings. Instead, utilitarians think that what makes a morality be true or justifiable is its positive contribution to human (and perhaps non-human) beings.” – Excerpt from the Internet Encyclopedia of Philosophy article on Act and Rule Utilitarianism by Stephen Nathanson.

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Virtue Ethics

Virtue ethics is a broad term for theories that emphasize the role of character and virtue in moral philosophy rather than either doing one’s duty or acting in order to bring about good consequences. A virtue ethicist is likely to give you this kind of moral advice: “Act as a virtuous person would act in your situation.”

Most virtue ethics theories take their inspiration from Aristotle who declared that a virtuous person is someone who has ideal character traits. These traits derive from natural internal tendencies, but need to be nurtured; however, once established, they will become stable. For example,  a virtuous person is someone who is kind across many situations over a lifetime because that is her character and not because she wants to maximize utility or gain favors or simply do her duty. Unlike deontological and consequentialist theories, theories of virtue ethics do not aim primarily to identify universal principles that can be applied in any moral situation. And virtue ethics theories deal with wider questions—“How should I live?” and “What is the good life?” and “What are proper family and social values?” – Excerpt from the Internet Encyclopedia of Philosophy article on Virtue Ethics by Nafsika Athanassoulis.

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Key Concepts

Animal Ethics

“What place should non-human animals have in an acceptable moral system? These animals exist on the borderline of our moral concepts; the result is that we sometimes find ourselves according them a strong moral status, while at other times denying them any kind of moral status at all. For example, public outrage is strong when knowledge of “puppy mills” is made available; the thought here is that dogs deserve much more consideration than the operators of such places give them. However, when it is pointed out that the conditions in a factory farm are as bad as, if not much worse than, the conditions in a puppy mill, the usual response is that those affected are “just animals” after all, and do not merit our concern.  Philosophical thinking on the moral standing of animals is diverse and can be generally grouped into three general categories: Indirect theories, direct but unequal theories, and moral equality theories.” – Excerpt from the Internet Encyclopedia of Philosophy article on Animals and Ethics by Scott D. Wilson.

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“What exactly does happiness involve? When people think about happiness in emotional terms, they tend to picture a specific emotion: feeling happy. So powerful is this association that happiness frequently gets reduced to nothing more than cheery feelings or ‘smiley-face’ feelings. This is a radically impoverished understanding of happiness: there’s much more to being happy than just feeling happy.

Think about those periods in your life when you were happiest. Not so much that day when you were elated over a special event, like the birth of a child. Rather, those times of relatively sustained happiness. Not everyone experiences such periods, but if you have, I suspect they looked something like […] good stretches of time wholly absorbed in something you love doing, feeling fully yourself and in your element. Energized, alive, and yet also, deeply settled and at peace—no doubts, no fretting, no hesitation. And yes, feelings of joy here and there, perhaps a good dose of laughter. But those feelings are not the most important part of the story.” – Excerpt from Happiness: A Very Short Introduction by Daniel Haybron.

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Intrinsic and Extrinsic Value

“Suppose that someone were to ask you whether it is good to help others in time of need. Unless you suspected some sort of trick, you would answer, “Yes, of course.” If this person were to go on to ask you why acting in this way is good, you might say that it is good to help others in time of need simply because it is good that their needs be satisfied. If you were then asked why it is good that people’s needs be satisfied, you might be puzzled. You might be inclined to say, “It just is.” Or you might accept the legitimacy of the question and say that it is good that people’s needs be satisfied because this brings them pleasure. But then, of course, your interlocutor could ask once again, “What’s good about that?” Perhaps at this point you would answer, “It just is good that people be pleased,” and thus put an end to this line of questioning. Or perhaps you would again seek to explain the fact that it is good that people be pleased in terms of something else that you take to be good. At some point, though, you would have to put an end to the questions, not because you would have grown tired of them (though that is a distinct possibility), but because you would be forced to recognize that, if one thing derives its goodness from some other thing, which derives its goodness from yet a third thing, and so on, there must come a point at which you reach something whose goodness is not derivative in this way, something that “just is” good in its own right, something whose goodness is the source of, and thus explains, the goodness to be found in all the other things that precede it on the list. It is at this point that you will have arrived at intrinsic goodness (cf. Aristotle, Nicomachean Ethics, 1094a). That which is intrinsically good is nonderivatively good; it is good for its own sake.” – Excerpt from the Stanford Encyclopedia of Philosophy article on Intrinsic vs. Extrinsic Value by Michael J. Zimmerman.

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“Aristotle teaches that justice means giving people what they deserve. And in order to determine who deserves what, we have to determine what virtues are worthy of honor and reward. Aristotle maintains that we can’t figure out what a just constitution is without first reflecting on the most desirable way of life. For him, law can’t be neutral on questions of the good life.

By contrast, modern political philosophers—from Immanuel Kant in the eighteenth century to John Rawls in the twentieth century—argue that the principles of justice that define our rights should not rest on any particular conception of virtue, or of the best way to live. Instead, a just society respects each person’s freedom to choose his or her own conception of the good life.

So you might say that ancient theories of justice start with virtue, while modern theories start with freedom. And in the chapters to come, we explore the strengths and weaknesses of each. But it’s worth noticing at the outset that this contrast can mislead.

For if we turn our gaze to the arguments about justice that animate contemporary politics—not among philosophers but among ordinary men and women—we find a more complicated picture. It’s true that most of our arguments are about promoting prosperity and respecting individual freedom, at least on the surface. But underlying these arguments, and sometimes contending with them, we can often glimpse another set of convictions—about what virtues are worthy of honor and reward, and what way of life a good society should promote. Devoted though we are to prosperity and freedom, we can’t quite shake off the judgmental strand of justice. The conviction that justice involves virtue as well as choice runs deep. Thinking about justice seems inescapably to engage us in thinking about the best way to live.” – Excerpt from Justice: What’s the Right Thing To Do? by Michael Sandel.

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“The term “hedonism,” from the Greek word ἡδονή (hēdonē) for pleasure, refers to several related theories about what is good for us, how we should behave, and what motivates us to behave in the way that we do. All hedonistic theories identify pleasure and pain as the only important elements of whatever phenomena they are designed to describe.  If hedonistic theories identified pleasure and pain as merely two important elements, instead of the only important elements of what they are describing, then they would not be nearly as unpopular as they all are. However, the claim that pleasure and pain are the only things of ultimate importance is what makes hedonism distinctive and philosophically interesting.” – Excerpt from the Internet Encyclopedia of Philosophy article on Hedonism by Andrew Moore.

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“You probably shouldn’t steal. Common sense tells us that stealing is wrong. But sometimes stealing seems less wrong, or not wrong at all, after we discover the cause of the stealing behavior. For example, if the fact that your family is starving causes you to steal a loaf of bread, many would say that you are not as blameworthy as someone who steals out of greed or spite. And imagine a kleptomaniac who cannot control her stealing behavior. We probably shouldn’t blame her for those actions (though we might encourage her to consult a therapist about her condition).

But why shouldn’t we blame the kleptomaniac? That is to say, how are we justified in holding the kleptomaniac morally responsible? One good reason not to blame the kleptomaniac is that she cannot help her behavior. She possesses a psychological problem that is out of her control. That’s why some defendants are acquitted on grounds of insanity. If you are not in control of your actions, you are not responsible for those actions.

But what if every one of our actions is actually out of our control. That is, what if only seems as if we have the freedom to choose between actions, but we are in fact as undeserving of blame as, say, the severely mentally ill?” – Excerpt from the 1000 Word Philosophy article on Free Will and Moral Responsibility by Chelsea Haramia.

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Further Reading

The best way to get started studying ethics is to pick up an introductory textbook or a classic work of moral philosophy. The following books are a good place to start:

Primary Sources:

Secondary Sources:

Miscellaneous Resources


Wireless Philosophy

Philosophy Tube

The Philosopher’s Arms Podcast

Philosophy Bites Podcast

Stanford Encyclopedia of Philosophy

Internet Encyclopedia of Philosophy

If you’d like to learn more about ethics, check out these introductory books on ethics.

And for more introductory philosophy resources and reading lists, check out this collection of Resources and Reading Lists.