Aristotle devoted two of the ten books of the Nicomachean Ethics to friendship. He thought it was that important. His treatment is one of the most influential discussions of human relationship in Western thought, and it is built around a distinction modern readers often miss. Aristotle did not think there was one thing called friendship. He thought there were three.
What He Was Trying to Explain
The Greek word Aristotle used was philia — a wider category than English friendship. Philia covered the bond between siblings, between business partners, between fellow citizens, between spouses, and between people we would call simply friends. Aristotle wanted to know what these relationships had in common, and where they differed.
His approach was characteristic. He noticed that people pursue and value friendship for several different reasons, and he organized those reasons into types. The result is a typology that has survived for nearly twenty-four hundred years.
Three Kinds of Friendship
Aristotle's classification rests on what each person gets from the other.
Friendship of utility. This is friendship in which the two parties find each other useful. The colleague who knows the right people, the contractor who does good work, the neighbor who watches your house when you travel — these are friends of utility. The relationship lasts as long as the usefulness lasts. When the contract ends, the job changes, the neighbor moves, the friendship typically ends with it.
Friendship of pleasure. This is friendship in which the two parties enjoy each other's company. The drinking buddy, the tennis partner, the witty colleague at lunch, the fellow concert-goer — these are friends of pleasure. The relationship lasts as long as the enjoyment lasts. When tastes change, when you grow tired of the same activities, when life pulls you in a different direction, the friendship typically dissolves.
Friendship of virtue, or "complete" friendship. This is friendship in which each person loves the other for who they are, not for what they provide. They are bonded by shared character — both are committed to becoming good. They wish each other well for the other's sake. They take genuine joy in each other's flourishing.
This last type, Aristotle says, is rare. It requires time. It requires good character on both sides. It requires the slow accumulation of shared experience and trust. He estimates it cannot really exist between strangers and warns that one cannot have many such friends at once.
Why Only One Kind Lasts
Aristotle was not a snob about the lower forms. He explicitly says that friendships of utility and pleasure are real friendships and that most human relationships fall into these categories. They are good. They make life better. They are a form of philia.
But they are also fragile by structure. Their basis is something external to the friend — what the friend can do for me, what enjoyment the friend can bring me. When the external basis disappears, so does the friendship. Aristotle is making an empirical claim, not a moral judgment: relationships built on contingent goods are dissolved when those goods are.
Friendship of virtue is different. Its basis is the friend himself — his character, his soul, the kind of person he is becoming. That basis does not go away when circumstances change. The friend is loved for who he is, not for what he does for me. A friendship like this can survive distance, hardship, even periods of disagreement. It does not depend on continued usefulness or continued pleasure.
This is why, Aristotle says, only the third kind can be called "complete" or "perfect" friendship. The other two are real but partial. The third one includes the other two — true friends do find each other useful and pleasant — but it is not constituted by usefulness or pleasure.
What Friends Actually Do
Aristotle thought hard about the practical features of true friendship. A few of his observations are still worth pausing over.
He says friends share their lives — they talk together, eat together, study together, work together. Friendship is not an abstract sentiment but a shared activity over time. You cannot be a true friend by post or by occasional visit. The relationship lives in the rhythm of common life.
He says friends are mirrors. Watching someone you love and respect live well teaches you how to live well. They show you what virtue looks like in motion. You correct yourself by their example, and they correct themselves by yours.
He says friends help each other become better. This is one of the most distinctive features of his account. A true friend is not the one who tells you what you want to hear; it is the one who challenges you to become more fully who you should be. Friendship of virtue is not stagnant — it is a partnership in the project of growing into a worthy human being.
And he says friends share grief and joy — what happens to one happens, in some sense, to the other. The neat boundaries between self-interest and other-interest dissolve in the friend's case. The friend's good is, somehow, your own.
What This Means Today
Modern readers often arrive at Aristotle expecting a self-help guide. They leave with something else: a high view of friendship that asks more of us than the way we typically use the word.
Most of what we call friendship today, Aristotle would have placed in the first two categories. Networking is friendship of utility. Hanging out is friendship of pleasure. These are not bad. But they are not what he meant by philia in its complete form, and confusing them tends to produce relationships that puzzle us when they fade.
His framework also poses a quiet question. Whom are you actually loving in your relationships — the person, or what they bring you? When you imagine the friend stripped of their charm, their connections, their convenience, do you still want them in your life? Friendship of virtue passes a hard test most relationships do not.
Why It Has Lasted
Aristotle's account has survived in part because it accurately describes something we recognize. Most of our relationships are real but bounded. A few — sometimes only one or two in a lifetime — go deeper. They feel different. They survive what other friendships do not. They make us better. They cannot be replaced by other people who happen to share our hobbies or our profession.
What Aristotle gave us is a vocabulary for that recognition. He took something we vaguely sense — that not all friendships are the same — and gave it structure. He did not think most of us would have many friendships of virtue. He thought, with characteristic understatement, that we should hope for the few we are given. That advice has not aged.
