Nicomachean Ethics

Aristotle’s Nicomachean Ethics is the book to read if you want to know how to live well. Written around 350 BCE and almost certainly compiled from lecture notes, it is not elegant by literary standards – it is dense, technical, and relentlessly systematic. But it is also the most psychologically astute account of moral life in the philosophical canon, the founding document of virtue ethics, and a work that rewards careful reading with insights of remarkable precision. Where Plato asks what justice is in some ideal form, Aristotle asks what the good life actually looks like for human beings as they are, embedded in bodies and communities and habits.

The Question of Eudaimonia

Aristotle begins with a deceptively simple observation: every action and pursuit aims at some good. But goods come in a hierarchy – some are pursued for the sake of others, others for their own sake. There must be some highest good, something pursued entirely for itself and never for anything else. This highest good Aristotle calls eudaimonia – usually translated as happiness, but better understood as flourishing, or living well and doing well.

Most people, Aristotle notes, identify happiness with pleasure, wealth, or honor. Each of these is a mistake. Pleasure is a byproduct of activity, not an end in itself. Wealth is purely instrumental. Honor depends entirely on those who bestow it. Eudaimonia, by contrast, must be something that constitutes a complete and self-sufficient life – something that makes a life good in itself, not merely by causing pleasant feelings.

The Doctrine of the Mean

Virtue, for Aristotle, is a settled disposition to act, feel, and respond in the right ways. It lies in a mean between extremes of excess and deficiency – not a mathematical midpoint but the mean relative to us, the response that the person of practical wisdom would choose. Courage is the mean between cowardice and recklessness. Generosity is the mean between miserliness and prodigality. Temperance is the mean between self-indulgence and insensibility to pleasure.

The mean is not mediocrity or moderation in some bland sense. The courageous person feels appropriate fear in genuinely dangerous situations. The generous person gives the right amounts to the right people at the right times for the right reasons. Getting it right requires perceptual sensitivity to particular situations that no general rule can capture in advance.

Practical Wisdom and the Role of Character

The virtue that governs all the others is phronesis – practical wisdom. This is the intellectual virtue that enables a person to perceive correctly what a situation requires and to deliberate well about how to achieve it. Practical wisdom is not a set of rules but a capacity for excellent judgment developed through experience. You cannot be truly virtuous without it, and you cannot have it without the moral virtues – practical wisdom requires the right motivations, not just the right conclusions.

This is one of Aristotle’s deepest insights: virtue is not primarily about following correct rules but about having a well-formed character. The virtuous person does not have to consult principles to know what to do; their feelings, perceptions, and desires have been trained to respond appropriately. Moral education is fundamentally the cultivation of character – of the right emotional dispositions – and this cultivation happens through practice.

Books VIII and IX: Friendship

Aristotle’s treatment of friendship (philia) in Books VIII and IX is one of the most substantial discussions of the topic in any philosophical work. He distinguishes three kinds: friendships of utility (we benefit each other), friendships of pleasure (we enjoy each other’s company), and friendships of virtue (we value each other for what we genuinely are).

Only the third kind is complete friendship. It is rarer than the others, requires genuine knowledge of the other person, and is the only kind that endures when circumstances change. It is inherently reciprocal – the friend of virtue wishes good things for the other as an end in themselves. Aristotle’s analysis of why we need friends even when we are virtuous – because self-knowledge is only possible through seeing ourselves reflected in another – is genuinely profound.

Contemplation and the Highest Life

Book X ends with a surprising turn. After ten books defending the life of practical virtue and civic engagement, Aristotle argues that the absolutely highest life is the life of contemplation (theoria) – the activity of the intellect for its own sake. The contemplative life is the best because the intellect is the highest part of us, its activity the most self-sufficient, the most continuous, and the most pleasant to those capable of it.

This creates a tension in the work that Aristotle never fully resolves. Is the highest life one of political and civic activity expressed through practical virtue, or one of philosophical contemplation? The tension reflects a genuine ambivalence about the relation between the divine intellect in us and our embodied social nature. Both aspects of human flourishing are real.

Verdict: The Practical Philosophy We Still Need

The Nicomachean Ethics remains the most practically useful philosophical work on living well, precisely because it takes seriously what human beings are actually like. Aristotle does not ask us to transcend our bodies, our emotions, or our social attachments – he asks us to cultivate them well. The insight that virtue is a matter of character rather than rule-following, that practical wisdom cannot be captured in algorithms, that friendship of the right kind is constitutive of the good life – these remain as true as the day they were written.

For contemporary readers, the Nicomachean Ethics offers a corrective to both rule-based and consequentialist ethics by insisting that who we are matters as much as what we do. This is not a comfortable philosophy, since it demands sustained self-cultivation rather than the application of principles. But it is, Aristotle persuades us, the only honest account of what the good life actually requires.

Frequently Asked Questions

What is eudaimonia in Aristotle’s ethics?

Eudaimonia is Aristotle’s term for the highest human good – usually translated as happiness but better understood as flourishing or living well. It is not a feeling but an activity: the activity of the soul in accordance with virtue over a complete life. It requires not just virtue but also sufficient external goods (health, friendship, adequate material means) to exercise virtue effectively.

What is the doctrine of the mean?

Aristotle argues that moral virtues are dispositions to feel and act in ways that hit a mean between extremes of excess and deficiency. Courage is the mean between cowardice and recklessness. The mean is not a fixed point but the response appropriate to the situation – what the person of practical wisdom would choose given all the relevant circumstances.

What is practical wisdom (phronesis)?

Practical wisdom is the intellectual virtue that governs all the moral virtues – the capacity to perceive what a situation requires and to deliberate well about how to achieve genuinely good ends. It cannot be reduced to following rules; it requires experiential knowledge of particular situations and the right emotional formation to perceive them correctly.

What are Aristotle’s three kinds of friendship?

Aristotle distinguishes friendships of utility (based on mutual benefit), friendships of pleasure (based on enjoyment), and friendships of virtue (based on genuine appreciation of each other’s character). Only the third is complete friendship – it requires real knowledge of the other person and endures because it is grounded in what the friends genuinely are.

How does Nicomachean Ethics differ from Plato’s ethics?

Where Plato grounds ethics in knowledge of eternal Forms, Aristotle grounds it in the nature and function of human beings as social animals. Aristotle is more willing to accept emotion and desire as components of virtuous character rather than obstacles to be overcome by reason. His ethics is more empirical, more contextual, and more attentive to the particularities of human life.

Is the Nicomachean Ethics still relevant today?

Profoundly so. The revival of virtue ethics in contemporary moral philosophy – associated especially with Alasdair MacIntyre, Philippa Foot, and Martha Nussbaum – is essentially a return to Aristotle. His insistence that moral philosophy must attend to character formation, the emotions, friendship, and the social conditions for human flourishing has proved more durable than either Kantian deontology or utilitarian consequentialism.

What is the function argument in the Nicomachean Ethics?

Aristotle argues that the good for any kind of thing is to perform its characteristic function excellently. The characteristic function of a human being – what distinguishes us from other animals – is the activity of the soul in accordance with reason. The good for human beings is therefore to perform this activity excellently – which means to live in accordance with the virtues of character and intellect.

Which translation of Nicomachean Ethics should I read?

Terence Irwin’s Hackett translation is widely used in university philosophy courses and is accurate and well-annotated. Roger Crisp’s Cambridge translation prioritizes readability. For readers coming to Aristotle for the first time, Irwin’s Hackett edition with its glossary and commentary is the most pedagogically useful.