3.: Three kinds of friendship, corresponding to the three motives Perfect friendship is that whose motive is the good. - Aristotle, The Nicomachean Ethics 
The Nichomachean Ethics of Aristotle, trans. F.H. Peters, M.A. 5th edition (London: Kegan Paul, Trench, Truebner & Co., 1893).
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- Preface to the Fifth Edition.
- Book I.: The End.
- 1.: In All He Does Man Seeks Same Good As End Or Means.
- 2.: The End Is the Good; Our Subject Is This and Its Science Politics.
- 3.: Exactness Not Permitted By Subject Nor to Be Expected By Student, Who Needs Experience and Training.
- 4.: Men Agree That the Good Is Happiness, But Differ As to What This Is.
- 5.: The Good Cannot Be Pleasure, Nor Honour, Nor Virtue.
- 6.: Various Arguments to Show Against the Platonists That There Cannot Be One Universal Good.
- 7.: The Good Is the Final End, and Happiness Is This.
- 8.: This View Harmonizes Various Current Views.
- 9.: It Happiness Acquired, Or the Gift of Gods Or of Chance?
- 10.: Can No Man Be Called Happy During Life?
- 11.: Cannot the Fortunes of Survivors Affect the Dead?
- 12.: Happiness As Absolute End Is Above Praise.
- 13.: Division of the Faculties and Resulting Division of the Virtues.
- Book II.: Moral Virtue.
- 1.: Moral Virtue Is Acquired By the Repetition of the Corresponding Acts.
- 2.: These Acts Must Be Such As Reason Prescribes; They Can’t Be Defined Exactly, But Must Be Neither Too Much Nor Too Little.
- 3.: Virtue Is In Various Ways Concerned With Pleasure and Pain.
- 4.: The Conditions of Virtuous Action As Distinct From Artistic Production.
- 5.: Virtue Not an Emotion, Nor a Faculty, But a Trained Faculty Or Habit.
- 6.: Viz., the Habit of Choosing the Mean.
- 7.: This Must Be Applied to the Several Virtues.
- 8.: The Two Vicious Extremes Are Opposed to One Another and to the Intermediate Virtue.
- 9.: The Mean Hard to Hit, and Is a Matter of Perception, Not of Reasoning.
- Book III.
- Chapters 1–5.: the Will.
- 1.: An Act Is Involuntary When Done (a) Under Compulsion, Or (b) Through Ignorance: (a) Means Not Originated By Doer, (b) Means Through Ignorance of the Circumstances: Voluntary Then Means Originated With Knowledge of Circumstances.
- 2.: Purpose, a Mode of Will, Means Choice After Deliberation.
- 3.: We Deliberate On What We Can Do—not On Ends, But Means.
- 4.: We Wish For
- 5.: Virtue and Vice Are Alike Voluntary, Our Acts Are Our Own; For We Are Punished For Them; If This Be Our Character, We Have Made It By Repeated Acts; Even Bodily Vices Are Blamable When Thus Formed. We Cannot Plead That Our Notion of Good Depends On Ou
- Chapters 6—12: the Several Moral Virtues and Vices.
- 6.: Of Courage and the Opposite Vices.
- 7. Of Courage (continued)
- 8. Of Courage Improperly So Called.
- 9.: How Courage Involves Both Pain and Pleasure.
- 10.: Of Temperance.
- 11. Of Temperance (continued)
- 12.: How Profligacy Is More Voluntary Than Cowardice.
- Book IV.: The Several Moral Virtues and Vices— Continued.
- 1.: Of Liberality.
- 2.: Of Magnificence.
- 3.: Of High-mindedness
- 4.: Of a Similar Virtue In Smaller Matters.
- 5.: Of Gentleness.
- 6.: Of Agreeableness.
- 7.: Of Truthfulness.
- 8.: Of Wittiness.
- 9.: Of the Feeling of Shame
- Book V.: The Several Moral Virtues and Vices— Concluded. Justice.
- 1.: Preliminary Two Senses of Justice Distinguished Justice (l) = Obedience to Law = Complete Virtue.
- 2.: Of Justice (2) = Fairness, How Related to Justice (1). What Is Just In Distribution Distinguished From What Is Just In Correction.
- 3.: Of What Is Just In Ditribution and Its Rule of Geometrical Proportion.
- 4.: Of That Which Is Just In Correction, and Its Rule of Arithmetical Proportion.
- 5.: Simple Requital Is Not Identical With What Is Just, But Proportionate Requital Is What Is Just In Exchange; and This Is Effected By Means of Money. We Can Now Give a General Definition of Justice (2).
- 6.: ( One Can Act Unjustly Without Being Unjust. ) That Which Is Just In the Strict Sense Is Between Citizens Only, For It Implies Law.
- 7.: It Is In Part Natural, In Part Conventional.
- 8.: The Internal Conditions of a Just Or Unjust Action, and of a Just Or Unjust Agent.
- 9.: Sundry Questions About Doing and Suffering Injustice
- 10.: Of Equity
- 11.: Can a Man Wrong Himself?
- Book VI.: The Intellectual Virtues.
- 1.: Must Be Studied Because (a) Reason Prescribes the Mean, (b) They Are a Part of Human Excellence. the Intellect Is (1) Scientific, (2) Calculative: We Want the Virtue of Each.
- 2.: The Function of the Intellect, Both In Practice and Speculation, Is to Attain Truth.
- 3.: Of the Five Modes of Attaining Truth: (1) of Demonstrative Science of Things Invariable.
- 4.: Of Knowledge of Things Variable, Viz. (2) of Art In What We Make;
- 5.: And (3) of Prudence In What We Do, the Virtue of the Calculative Intellect.
- 6.: (4) of Intuitive Reason As the Basis of Demonstrative Science.
- 7.: (5) of Wisdom As the Union of Science and Intuitive Reason. Comparison of the Two Intellectual Virtues, Wisdom and Prudence.
- 8.: Prudence Compared With Statesmanship and Other Forms of Knowledge.
- 9.: Of Deliberation.
- 10.: Of Intelligence
- 11.: Of Judgment of Reason Or Intuitive Perception As the Basis of the Practical Intellect.
- 12.: Of the Uses of Wisdom and Prudence. How Prudence Is Related to Cleverness.
- 13.: How Prudence Is Related to Moral Virtue
- Book VII.
- Chapters 1–10.: Characters Other Than Virtue and Vice.
- 1.: Of Continence and Incontinence, Heroic Virtue and Brutality. of Method. Statement of Opinions About Continence.
- 2.: Statement of Difficulties As to How One Can Know Right and Do Wrong.
- 3.: Solution: to Know Has Many Senses; In What Sense Such a Man Knows.
- 4.: Of Incontinence In the Strict and In the Metaphorical Sense.
- 5.: Of Incontinence In Respect of Brutal Or Morbid Appetites.
- 6.: Incontinence In Anger Less Blamed Than In Appetite.
- 7.: Incontinence Yields to Pleasure, Softness to Pain. Two Kinds of Incontinence, the Hasty and the Weak.
- 8.: Incontinence Compared With Vice and Virtue.
- 9.: Continence and Incontinence Not Identical With Keeping and Breaking a Resolution.
- 10.: Prudence Is Not, But Cleverness Is, Compatible With Incontinence.
- Chapters 11—14.: of Pleasure.
- 11.: We Must Now Discuss Pleasure. Opinions About It.
- 12.: Answers to Arguments Against Goodness of Pleasure. Ambiguity of Good and Pleasant. Pleasure Not a Transition, But Unimpeded Activity.
- 13.: Pleasure Is Good, and the Pleasure That Consists In the Highest Activity Is the Good. All Admit That Happiness Is Pleasant. Bodily Pleasures Not the Only Pleasures.
- 14.: Of the Bodily Pleasures, and the Distinction Between Naturally and Accidentally Pleasant.
- Book VIII.: Friendship Or Love.
- 1.: Uses of Friendship. Differences of Opinion About It.
- 2.: Three Motives of Friendship. Friendship Defined.
- 3.: Three Kinds of Friendship, Corresponding to the Three Motives Perfect Friendship Is That Whose Motive Is the Good.
- 4.: The Others Are Imperfect Copies of This.
- 5.: Intercourse Necessary to the Maintenance of Friendship.
- 6.: Impossible to Have Many True Friends.
- 7.: Of Friendship Between Unequal Persons and Its Rule of Proportion. Limits Within Which This Is Possible.
- 8.: Of Loving and Being Loved.
- 9.: Every Society Has Its Own Form of Friendship As of Justice. All Societies Are Summed Up In Civil Society.
- 10.: Of the Three Forms of Constitution.
- 11.: Of the Corresponding Forms of Friendship.
- 12.: Of the Friendship of Kinsmen and Comrades.
- 13.: Of the Terms of Interchange and Quarrels Hence Arising In Equal Friendships.
- 14.: Of the Same In Unequal Friendships.
- Book IX.: Friendship Or Love— Continued.
- 1.: Of the Rule of Proportion In Dissimilar Friendships.
- 2.: Of the Conflict of Duties.
- 3.: Of the Dissolution of Friendships.
- 4.: A Man’s Relation to His Friend Like His Relation to Himself.
- 5.: Friendship and Goodwill.
- 6.: Friendship and Unanimity
- 7.: Why Benefactors Love More Than They Are Loved.
- 8.: In What Sense It Is Right to Love One’s Self.
- 9.: Why a Happy Man Needs Friends.
- 10.: Of the Proper Number of Friends.
- 11.: Friends Needed Both In Prosperity and Adversity.
- 12.: Friendship Is Realized In Living Together.
- Book X.
- Chapters 1–5.: Pleasure.
- 1.: Reasons For Discussing Pleasure.
- 2.: Arguments of Eudoxus That Pleasure Is the Good.
- 3.: Argument That It Is Not a Quality; That It Is Not Determined; That It Is a Motion Or Coming Into Being. Pleasures Differ In Kind.
- 4.: Pleasure Defined: Its Relation to Activity.
- 5.: Pleasures Differ According to the Activities the Standard Is the Good Man.
- Chapters 6–9.: Conclusion.
- 6.: Happiness Not Amusement, But Life.
- 7.: Of the Speculative Life As Happiness In the Highest Sense.
- 8.: Of the Practical Life As Happiness In a Lower Sense, and of the Relation Between the Two. Prosperity, How Far Needed.
- 9.: How Is the End to Be Realized?
Three kinds of friendship, corresponding to the three motives Perfect friendship is that whose motive is the good.
But these three motives are specifically different from one another; the several affections and friendships based upon them, therefore, will also be specifically different. The kinds of friendship accordingly are three, being equal in number to the motives of love; for any one of these may be the basis of a mutual affection of which each is aware.
Now, those who love one another wish each other’s good in respect of that which is the motive of their love. Those, therefore, whose love for one another is based on the useful, do not love each other for what they are, but only in so far as each gets some good from the other.
It is the same also with those whose affection is based on pleasure; people care for a wit, for instance, not for what he is, but as the source of pleasure to themselves.
Those, then, whose love is based on the useful care for each other on the ground of their own good, and those whose love is based on pleasure care for each other on the ground of what is pleasant to themselves, each loving the other, not as being what he is, but as useful or pleasant.
These friendships, then, are “accidental;” for the object of affection is loved, not as being the person or character that he is, but as the source of some good or some pleasure. Friendships of this kind, therefore, are easily dissolved, as the persons do not continue unchanged; for if they cease to be pleasant or useful to one another, their love ceases. But the useful is nothing permanent, but varies from time to time. On the disappearance, therefore, of that which was the motive of their friendship, the friendship itself is dissolved, since it existed solely with a view to that.
Friendship of this kind seems especially to be found among elderly men (for at that time of life men pursue the useful rather than the pleasant) and those middle-aged and young men who have a keen eye to what is profitable. But friends of this kind do not generally even live together; for sometimes they are by no means pleasant (nor indeed do they want such constant intercourse with others, unless they are useful); for they make themselves pleasant only just so far as they have hopes of getting something good thereby.
With these friendships is generally classed the kind of friendship that exists between host and guest.
The friendship of young men is thought to be based on pleasure; for young men live by impulse, and, for the most part, pursue what is pleasant to themselves and what is immediately present. But the things in which they take pleasure change as they advance in years. They are quick to make friendships, therefore, and quick to drop them; for their friendship changes as the object which pleases them changes; and pleasure of this kind is liable to rapid alteration.
Moreover, young men are apt to fall in love; for love is, for the most part, a matter of impulse and based on pleasure: so they fall in love, and again soon cease to love, passing from one state to the other many times in one day.
Friends of this kind wish to spend their time together and to live together; for thus they attain the object of their friendship.
But the perfect kind of friendship is that of good men who resemble one another in virtue. For they both alike wish well to one another as good men, and it is their essential character to be good men. And those who wish well to their friends for the friends’ sake are friends in the truest sense; for they have these sentiments towards each other as being what they are, and not in an accidental way: their friendship, therefore, lasts as long as their virtue, and that is a lasting thing.
Again, each is both good simply and good to his friend; for it is true of good men that they are both good simply and also useful to one another.
In like manner they are pleasant too; for good men are both pleasant in themselves and pleasant to one another: for every kind of character takes delight in the acts that are proper to it and those that resemble these; but the acts of good men are the same or similar.
This kind of friendship, then, is lasting, as we might expect, since it unites in itself all the conditions of true friendship. For every friendship has for its motive some good or some pleasure (whether it be such in itself or relatively to the person who loves), and is founded upon some similarity: but in this case all the requisite characteristics belong to the friends in their own nature; for here there is similarity and the rest, viz. what is good simply and pleasant simply, and these are the most lovable things: and so it is between persons of this sort that the truest and best love and friendship is found.
It is but natural that such friendships should be uncommon, as such people are rare. Such a friendship, moreover, requires long and familiar intercourse. For, as the proverb says, it is impossible for people to know one another till they have consumed the requisite quantity of salt together. Nor can they accept one another as friends, or be friends, till each show and approve himself to the other as worthy to be loved. Those who quickly come to treat one another like friends may wish to be friends, but are not really friends, unless they not only are lovable, but know each other to be so; a wish to be friends may be of rapid growth, but not friendship.
This kind of friendship, then, is complete in respect of duration and in all other points, and that which each gets from the other is in all respects identical or similar, as should be the case with friends.