4.: A man’s relation to his friend like his relation to himself. - 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?
A man’s relation to his friend like his relation to himself.
Friendly relations to others, and all the characteristics by which friendship is defined, seem to be derived from our relations towards ourselves. A friend is sometimes described as one who wishes and does to another what is good or seems good for that other’s sake, or as one who wishes his friend to exist and to live for his (the friend’s) sake. (This is what mothers feel towards their children, and what friends who have had a difference feel for one another.) Others describe a friend as one who lives with another and chooses what he chooses, or as one who sympathizes with the griefs and joys of his friend. (This, also, is especially the case with mothers.) And, similarly, friendship is usually defined by some one or other of these characteristics.
Now, every one of these characteristics we find in the good man’s relations to himself (and in other men just so far as they suppose themselves to be good; but it seems, as we have said, that virtue and the good man are in everything the standard): for the good man is of one mind with himself, and desires the same things with all his soul, and wishes for himself what both is and seems good, and does that (for it is characteristic of him to work out that which is good) for his own sake—for the sake, that is to say, of the rational part of him, which seems to be a man’s self. And he wishes his self to live and be preserved, and especially that part of his self by which he thinks: for existence is good to the good man. But it is for himself that each wishes the good; no one would choose to have all that is good (as e.g. God is in complete possession of the good) on condition of becoming some one else, but only on condition of still being just himself. But his reason would seem to be a man’s self, or, at least, to be so in a truer sense than any other of his faculties.
Such a man also wishes to live with himself; for his own company is pleasant to him. The memory of his past life is sweet, and for the future he has good hopes; and such hopes are pleasant. His mind, moreover, is well stored with matter for contemplation: and he sympathizes with himself in sorrow and in joy; for at all seasons the same things give him pain and pleasure, not this thing now, and then another thing,—for he is, so to speak, not apt to change his mind.
Since, then, all these characteristics are found in the good man’s relations to himself, and since his relations to his friend are the same as his relations to himself (for his friend is his second self), friendship is described by one or other of these characteristics, and those are called friends in whom these characteristics are found.
The question whether friendship towards one’s self is or is not possible may be dismissed at present; but that it is possible so far as one has two or more selves would seem to follow from what has been already said, and also from the fact that the extreme of friendship for another is likened to friendship for one’s self.
But the characteristics we have mentioned appear to be found in the generality of men, though they are not good. Perhaps we may say that so far as they are agreeable to themselves, and believe they are good, so far do they share these characteristics. People who are utterly worthless and impious never have them, nor do they even seem to have them. But we might almost say roundly that they are wanting in all who are not good; for such men are not at one with themselves: they desire one thing while they wish another, as the incontinent do, for instance (for, instead of what they hold to be good, they choose what is pleasant though injurious). Others, again, through cowardice or laziness, shrink from doing that which they believe is the best for them; while those who have done many terrible things out of wickedness, hate life, and wish to get rid of it, and sometimes actually destroy themselves.
Bad men try to find people with whom to spend their time, and eschew their own company; for there is much that is painful in the past on which they look back and in the future to which they look forward when they are by themselves, but the company of others diverts them from these thoughts. As there is nothing lovable in them, they have no friendly feelings towards themselves.
He who is not good, then, cannot sympathize with himself in joy or sorrow; for his soul is divided against itself: one part of him, by reason of its viciousness, is pained at being deprived of something, while another part of him is pleased; one part pulls this way, another that, tearing him to pieces, as it were, between them. Or if it be impossible to be pained and pleased at the same time, yet, at any rate, after a short interval he is pained that he was pleased, and wishes that he had never partaken of this pleasure; for those who are not good are full of remorse.
Thus we may say roundly that he who is not good has no friendly feelings even for himself, as there is nothing lovable in him. If, then, to be in this state is utterly miserable, we ought to strain every nerve to avoid vice, and try to be good; for thus we may be friendly disposed towards ourselves, and make friends with others.