Quick answer
A line strengthens platonic love when it is the sentence the author wrote and it fits that friend. Aristotle, Cicero, Montaigne, and Emerson are not saying the same thing, and the popular wording is often a different translation.
A sentence can carry platonic love only when it is the sentence the author actually wrote, and only when it fits the particular friend you are writing to. The four texts below are not interchangeable posters. Aristotle is talking about a stable character friendship that takes time. Cicero is talking about how a true friend changes the weight of good and bad fortune. Montaigne is talking about one irreplaceable person. Emerson is talking about sincerity and the refusal to become an echo. If you send the wrong line, you are not celebrating the bond. You are borrowing a mood.
What follows is a reading of four public-domain works on non-romantic love, then a rule for placing one accurate line in a note, a toast, or a card.
Aristotle: the wish is quick, the friendship is not
In W. D. Ross's translation of the Nicomachean Ethics, Book VIII, Aristotle writes: "For without friends no one would choose to live, though he had all other goods." He is not ranking romance beneath friendship, and he is not offering a caption for a group photo. He is arguing that friendship (philia) is both necessary and noble, and that the highest form of it is uncommon.
Ross's text distinguishes three grounds of love: the useful, the pleasant, and the good. Friendships of utility and pleasure are real, and Aristotle says we should still call them friendships, but they are incidental. People in them "do not love each other for themselves but in virtue of some good which they get from each other." When the usefulness or the pleasure changes, the bond loosens. "Perfect friendship," in this translation, "is the friendship of men who are good, and alike in virtue," and "those who wish well to their friends for their sake are most truly friends."
Two sentences in the same book are constantly flattened on quote sites. Ross has Aristotle say that "a wish for friendship may arise quickly, but friendship does not," and that people "cannot know each other till they have 'eaten salt together.'" The salted-meal image is about shared ordinary time, not about a spark. A popular compression, "friendship is a slow ripening fruit," catches the pace and loses the argument. If you want Aristotle in a note to a long friend, quote the wish-versus-friendship sentence, name Book VIII, and name the translation. Do not upgrade a paraphrase into a quotation.
The practical force of the passage is narrow. A friend you value for a favor, a scene, or a season is not a failed version of the friend you value for their character. Aristotle thinks those are different bonds. A card that says "you are useful to me" is honest and small. A card that says "I wish you well for your sake, not for what you do for me" is the sentence his best kind of friendship is trying to earn. It also takes the salt: he thinks you do not get to say it on the first evening.
Cicero: fortune shared, not fortune flattered
Cicero's Laelius de Amicitia (44 BC) is a dialogue in praise of a demanding friendship, not a general license to call everyone a friend. In the Loeb translation by W. A. Falconer, section 22 says: "For friendship adds a brighter radiance to prosperity and lessens the burden of adversity by dividing and sharing it."
That is not the line most cards use. Joseph Addison's 1711 rendering in The Spectator is the famous one: friendship "improves happiness and abates misery, by the doubling of our joy and the dividing of our grief." Addison's sentence is Addison's. It is a legitimate translation in the broad sense, and it is a bad thing to attribute to Cicero as if the Latin were a greeting-card rhyme. Falconer's public-domain English stays closer to the division and sharing. If you write the Addison sentence, say so.
The surrounding argument matters more than the cadence. Falconer has Cicero ask what life is worth if it does not rest on a friend's goodwill, and what is sweeter than someone "with whom you may dare discuss anything as if you were communing with yourself." The gift in this passage is not advice. It is a witness who makes success brighter because someone is glad with you, and makes trouble lighter because someone carries part of it. That is a specific job. It is different from Aristotle's "wish him well for his sake," and different from a promise that you will never disagree.
Use Cicero when the occasion is a shared load or a shared luck: a friend who sat with you through a hospital week, a friend who is the first person you call when something good happens and you need it to be real. Do not use Cicero as a generic "thanks for being you." The text is about dividing and sharing, which means the friend did something with your fortune, not merely existed beside it.
Montaigne: one person, not a type
Michel de Montaigne's essay "Of Friendship" is about Étienne de La Boétie, who died in 1563. In Charles Cotton's translation, as revised by William Carew Hazlitt and preserved in the Project Gutenberg text, Montaigne writes: "If a man should importune me to give a reason why I loved him, I find it could no otherwise be expressed, than by making answer: because it was he, because it was I."
He has just said that ordinary bonds leave "some little intercourse" between souls, while the friendship he means mixes two people "into one piece, with so universal a mixture, that there is no more sign of the seam." He also says they were not following the slow pattern of friendships that need "many precautions of long preliminary conversation." Their time was short because they met as adults and La Boétie died young. Montaigne is describing an exception, and he knows it.
This line is a poor all-purpose friendship quote. "Because it was he, because it was I" refuses the résumé: not because he was clever, loyal, funny, or useful, but because the two of them were those two people. Send it only where you could defend the refusal. If you love this friend for a list of traits you could find in someone else, you are in Aristotle's pleasant or useful friendship, and Montaigne's sentence will sound false. If the friendship is the one you cannot justify without pointing at the person, the sentence is exact.
Attribution here is part of the respect. Name Montaigne, name the essay, and do not pretend the line was written about your group chat. It was written in grief for one man. Borrowing it for a birthday is allowed. Pretending it is a proverb is not.
Emerson: sincerity, and the right to be a nettle
Ralph Waldo Emerson's "Friendship," in the 1841 Essays: First Series, gives the sentence people actually want when they say a friend "gets" them. The Project Gutenberg text reads: "A friend is a person with whom I may be sincere. Before him I may think aloud." A little later: "The only way to have a friend is to be one." And, against the friend who only agrees: "Better be a nettle in the side of your friend than his echo."
These three lines do different work, and they should not be stacked as one mood. "Think aloud" is permission to drop what Emerson calls the garments of "dissimulation, courtesy, and second thought." It is about unguarded speech, not about constant contact. "The only way to have a friend is to be one" is a rebuke to arrangement and introduction. Emerson says you will not come nearer a person by getting into their house if your own character is unlike theirs. "Be a nettle" refuses the counterfeit of closeness that is really compliance. He wants "very two" before there can be "very one."
That last line is the one to send a friend who tells you the truth and pays for it, or a friend you owe an apology for only applauding them. It is a bad line for a friend in fresh grief who needs company, not friction. Emerson is not saying every message should sting. He is saying high friendship dies if one person becomes a mirror.
How to put a real line in a real note
Pick the job before you pick the author.
- If the point is "this took time, and I wish you well for your own sake," use Aristotle, Book VIII, and name Ross if you use his English.
- If the point is "you shared the weight of this year," use Cicero, De Amicitia 22, and decide whether you are quoting Falconer or Addison.
- If the point is "I cannot swap you for a similar person," use Montaigne on La Boétie, and keep the sentence intact.
- If the point is "I can think aloud with you" or "you were right to push back," use the matching Emerson sentence, not all of them at once.
Then do four small things in the note itself. Name the author and the work. Quote a short span, not a paragraph you have not read. Add one sentence that could only be about this friend: a week, a joke, a favor, a disagreement. Stop. A quotation that needs a speech attached has already failed. A quotation with no personal sentence is a forward.
Check the wording against a text you can open. The Ross Ethics is on the MIT Classics site. Falconer's Cicero is on LacusCurtius and in Project Gutenberg. Cotton's Montaigne is in Gutenberg volume 6 of the Essays. Emerson's "Friendship" is in Gutenberg's Essays. If a page says "Unknown," or "LovePinnacle," or gives Cicero Addison's rhyme without saying so, do not pass it on. Platonic love is not strengthened by a counterfeit line. It is strengthened by a true one, aimed at one person, with the source still attached.
Sources
- Aristotle, Nicomachean Ethics, Book VIII, trans. W. D. Ross, MIT Classics: https://classics.mit.edu/Aristotle/nicomachaen.8.viii.html
- Cicero, Laelius de Amicitia, sec. 22, trans. W. A. Falconer (1923), LacusCurtius: http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Cicero/Laelius_de_Amicitia/text*.html
- Addison's different English appears in his Spectator no. 68 (18 May 1711); a side-by-side of the renderings is collected at https://wist.info/cicero-marcus-tullius/46037/
- Montaigne, "Of Friendship," trans. Charles Cotton, rev. W. C. Hazlitt, Project Gutenberg: https://www.gutenberg.org/cache/epub/3586/pg3586.html
- Emerson, "Friendship," Essays: First Series (1841), Project Gutenberg: https://www.gutenberg.org/files/16643/16643-h/16643-h.htm
Frequently Asked Questions
- Which English version of Cicero's friendship line should I quote?
- W. A. Falconer's 1923 Loeb translation of De Amicitia section 22 says friendship adds a brighter radiance to prosperity and lessens adversity by dividing and sharing it. Joseph Addison's 1711 Spectator line about doubling joy and dividing grief is Addison's English. Name the translator you are actually using.
- Did Aristotle write that friendship is a slow ripening fruit?
- That slogan is a paraphrase. In W. D. Ross's translation of Nicomachean Ethics Book VIII, Aristotle says a wish for friendship may arise quickly, but friendship does not, and that people cannot know each other until they have eaten salt together.
- Who is Montaigne talking about in 'because it was he, because it was I'?
- The sentence, in Charles Cotton's translation as revised by William Carew Hazlitt, is about his friend Étienne de La Boétie, who died in 1563. It is a claim that this one person was not interchangeable, not a general proverb.
- What does Emerson mean by telling you to be a nettle rather than an echo?
- In the 1841 essay Friendship he argues that high friendship needs two distinct people. Constant agreement destroys the relation he is praising. The line fits a friend who tells you the truth, not a friend who needs comfort that day.
- How do I use one of these lines in a note?
- Name the author and the work, quote a short span you have checked against a text, add one sentence only this friend would recognize, and stop. If the page says Unknown, do not pass the line on.
- Are these four writers giving the same advice about platonic love?
- No. Aristotle separates useful, pleasant, and character friendship and insists the best kind takes time. Cicero is about sharing fortune. Montaigne refuses to justify one particular friend. Emerson is about sincerity and not becoming a mirror.