Eudaimonia Is Not Happiness
A life assessable only as a whole, and possibly ruinable after your death. The opposite of a wellbeing metric.
The standard translation of eudaimonia is "happiness," and it has done more damage than any other rendering in ancient philosophy. Happiness in English names a feeling: something you have now, that you are the authority on, that could in principle be sampled by asking you.
Eudaimonia is none of those. It is not a feeling, you are not automatically the authority on whether you have it, and it cannot be sampled at a moment, because it is a property of a life. "Flourishing" is the least bad substitute — the word we use for plants, which are doing well or badly regardless of their opinion on the matter.
The argument from function
Aristotle does not simply assert what the human good is; he argues for it, and the argument is worth following because everything downstream depends on it.
The premise is that for anything with a characteristic activity, its good consists in performing that activity well. A flautist's good is playing well; an eye's good is seeing well. If humans have a characteristic activity, the human good will be performing it well.
So what is it? Not mere living — plants do that. Not perception — animals do that. What is distinctive is activity of the part of us that has reason. Therefore the human good is activity of the soul in accordance with virtue, and if there are several virtues, in accordance with the best and most complete. And then the clause that changes everything: in a complete life. One swallow does not make a spring, he says, nor does one day; and neither does one day or a short time make a person blessed and happy.
Notice that the conclusion is an activity, not a state and not an experience. Eudaimonia is not something that happens to you after you have done well. It is the doing well.
Luck is allowed to ruin it
This is where Aristotle parts company with the Stoics, who arrive later in this series, and where he is at his most unsentimental.
Flourishing needs equipment. Aristotle lists friends, wealth enough to act generously, political influence, good birth, decent children, tolerable looks, health. Not because these are the good — they are not — but because a life of virtuous activity is not fully available to someone who lacks them. The person being tortured, or destitute, or bereaved of every friend, is not flourishing, and it would be a cruelty dressed as philosophy to say otherwise.
He takes the point seriously enough to face its hardest case. Priam, king of Troy, lived admirably and then watched his city fall and his family destroyed at the end of his life. Aristotle will not say Priam flourished. Great misfortune, he says, can crush and mar blessedness — and though the person of good character bears it nobly, and never becomes wretched in the sense of doing base things, they are not blessed either.
This is a substantial philosophical concession. It means the best possible human life is not fully within human control, which is exactly the conclusion the Stoics later refused to accept, and their refusal is the hinge of everything that follows in part 10.
The Greek proverb said to call no one happy until they are dead. Aristotle takes it literally enough to ask whether events after your death — a child's disgrace, a reputation destroyed — can affect whether your life went well. He decides they can, at least to some degree, and that the influence is faint. Whatever you think of the answer, note what the question presupposes: a life is assessed as a completed whole, and you do not get to file the report yourself.
Why this is the opposite of a wellbeing score
Put the two frameworks side by side and the contrast is total.
A wellbeing metric is self-reported, sampled at a moment, aggregated over people, and improved by anything that raises the number. That last property is the interesting one: on that framework, if a drug, a distraction, or a comfortable delusion raises reported satisfaction, it improves wellbeing by definition. There is nothing further to appeal to.
On Aristotle's account there is something further, and it is the whole point. A person can report high satisfaction while their life is going badly — not because they are lying, but because how well a life is going is not settled by how it feels from inside. The eudaimonist framework has room to say that a contented life spent on nothing was a waste. The satisfaction framework has no vocabulary for that judgment, which is a strange gap in a theory of how life should go.
The cost of Aristotle's position is obvious and he pays it openly: it is elitist in structure and unquantifiable in practice. Flourishing requires resources not everyone has, it is assessed from outside, and there is no instrument for it. What it buys is a concept that does not collapse the question "is this a good life?" into "does it feel good?" — and once you have seen the two come apart, the collapse is hard to accept again.
Eudaimonia is rational activity done well across a complete life, not a feeling and not a self-report. It needs luck and equipment, which means it is not fully in your control — the concession the Stoics were about to refuse — and it is assessed as a whole, from outside, which is why no survey can measure it.