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Who really said it

Wine is sunlight, held together by water

Galileo — reported at second hand, and not in these words Galileo Galilei 1564–1642 · Italian astronomer, physicist and mathematician
Disputed Rights unconfirmed

Galileo left nothing like this in writing. The whole basis for the saying is a letter of Lorenzo Magalotti’s, printed in his Lettere scientifiche ed erudite (Florence, 1721), p. 43 ↗: “Mi disse una volta il buon Don Raffaello Magiotti, che il Galileo era usato di dire, che il vino è un composto d’umore, e di luce” — the good Don Raffaello Magiotti once told me that Galileo used to say that wine is a compound of moisture and light. Wikiquote carries that saying, from the same 1721 source, as “Wine is a mixture of moisture and light” ↗. The version in circulation swaps moisture for water and light for sunlight and adds a verb; it is a translator’s improvement on a report of a remark, and nobody has established whose.

Last verified 22 Aug 2026 · how we verify · spot an error?

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Disputed wording — copy with the correction

“Wine is sunlight, held together by water” Galileo, but not in these words. The only source for the saying is Lorenzo Magalotti, Lettere scientifiche ed erudite (Florence, 1721), p. 43, reporting what Don Raffaello Magiotti told him Galileo "era usato di dire": "il vino è un composto d'umore, e di luce" — wine is a compound of moisture and light. Nothing Galileo wrote contains it, and the English wording is an unattributed modern paraphrase. Traced by Quotle.info. · Verbatim: “Wine is a mixture of moisture and light”

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In context

Evoking the themes of knowledge, creativity and happiness. Theme: "Wine is sunlight, held together by water". Atmospheric and restrained, cinematic directional light, a muted period-appropriate palette, fine grain and texture. Compose with generous empty space for the quote and a small credit line. No lettering in the image itself.

Minimalist

Minimalist editorial slide for the quote "Wine is sunlight, held together by water". Clean background, a single muted accent color, generous negative space, subtle paper or linen texture, no literal illustration — let the words carry it. Reserve clear space for a serif quote and a small credit line. No lettering in the image itself.

Provenance

A remark, reported at two removes

Work
Lettere scientifiche ed erudite
Author
Lorenzo Magalotti (1637–1712), secretary of the Accademia del Cimento
Published
In Firenze, per i Tartini e Franchi, M.DCC.XXI — nine years after Magalotti’s death and 79 after Galileo’s
Located
Lettera V, p. 43; the same saying also at Lettera II, p. 15
Chain
Galileo → Don Raffaello Magiotti → Magalotti → print

… io vo dirle cosa in maggior commendazione della vendemmia, e del vino, pure in ordine alle filosofiche contemplazioni. Mi disse una volta il buon Don Raffaello Magiotti, che il Galileo era usato di dire, che il vino è un composto d’umore, e di luce; sicchè ella vede quant’anche, a detta di sì grand’uomo, crescerebbe di condizione il suo gentilissimo trattenimento del fare i vini. E vo dirle il vero, ch’io ho più volte fantasticato sopra questa cosa, per arrivare a intendere quello, che si volesse inferire il Galileo…

Transcribed from the 1721 scan, with the long ‘s’ modernised. Magalotti sets the six words he is reporting in italic — vino è un composto d’umore, e di luce — and everything around them is his own prose. He then admits he has puzzled over what Galileo meant by it more than once, which is not how a man writes about a sentence he has in front of him.

Magalotti, Lettere scientifiche ed erudite (1721), p. 43, at the Internet Archive

How we verified this

Magalotti’s 1721 volume ↗ is long out of copyright and freely readable at the Internet Archive, as is Dante’s text ↗. The English sentence at the top of this page is another matter: it is a loose modern rendering by an unidentified translator, of a date nobody has established, so we assert no rights status for it rather than invent one.

Rights status is our research, not legal advice — and copyright varies by country and edition. For commercial or published use, confirm with the rightsholder. See terms.

Fact-check

Right man, wrong words

This is not a fake quote and Galileo is not the wrong person to put under it. It is a genuine reported saying that has been improved in translation until it stopped being the sentence anybody reported.

Galileo Galilei Modern paraphrase

Nothing Galileo wrote contains it, and the seventeenth-century report has him saying wine is un composto d’umore, e di luce ↗ — a compound of moisture and light. “Sunlight” for luce, “water” for umore and “held together by” for composto are all an English writer’s choices, and we could not find out whose.

Galileo Galilei, as reported by Lorenzo Magalotti in 1721

Wikiquote gives it as “Wine is a mixture of moisture and light” ↗ on the strength of the same 1721 letters. That much is defensible — a named seventeenth-century informant, in print, saying this is what Galileo used to say. It is also all there is.

Don Raffaello Magiotti (1597–1656) Reporter, not the author

A pupil of Castelli in Rome who kept Galileo informed of Roman scientific debate ↗, and the one person Magalotti names. Magalotti was still in his teens when Magiotti died in 1656, so the remark had already travelled a generation before it was written down, and another 65 years before it was printed.

Dante, Purgatorio XXV Ancestor, not the author

Magalotti himself says Galileo “avealo peravventura imparato dal Poeta maggiore” — had perhaps learned it from the greater poet — and quotes the lines about the sun’s heat becoming wine when joined to the moisture that flows from the vine ↗. Sunlight and moisture were in the picture, in Italian verse, long before Galileo was born.

Galileo very likely said something close to this, and one seventeenth-century witness says so at p. 43 of Magalotti’s letters ↗. He did not say it in English, and he did not say it in these words.

Context

Why it mattered

The remark is doing real work, which is why it survived. Magalotti’s whole letter is about whether light is a substance that can get inside things — he has just been discussing how fire penetrates metal — and a glass of wine is his best case: something that visibly is the summer it grew in. Calling wine a compound of moisture and light is a claim about physics dressed as a toast.

It is also, as Magalotti admits on the page, a puzzle he never solved: he says he has “fantasticato” over it more than once trying to work out what Galileo meant, and had put the question to nobody but Vincenzio Viviani, Galileo’s last pupil. The sentence people repeat today has all of that sanded off. It is prettier and it means less.

Il vino è un composto d’umore, e di luce — the six words a witness actually reports.

Read the full story

The chain is worth laying out because it is the whole case. Galileo died in 1642. Raffaello Magiotti ↗, who corresponded with him from Rome, died in 1656. Lorenzo Magalotti ↗ — born 1637, later secretary of the Accademia del Cimento and author of its Saggi di naturali esperienze — heard the remark from Magiotti and wrote it into a letter. The letters were printed in 1721, nine years after Magalotti’s own death. Every step of that is documented; not one step of it is Galileo writing anything down.

A footnote on how the modern wording travels: Wikiquote’s page on wine ↗ captions a photograph “Wine is sunlight, held together by water. —Galileo Galilei,” with no citation attached, while its page on Galileo ↗ carries only the sourced 1721 form. The same site holds both versions, and only one of them has a source under it. That is roughly how the sentence got everywhere.

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More provenance-checked quotes on the same theme, each with its reuse status.

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Trusted places to keep pulling the thread — primary archives, fact-checks, and scholarship. We show how we used each one before you leave.

Wikiquote: Galileo Galileien.wikiquote.org

Carries the sourced form — “Wine is a mixture of moisture and light” — and cites Magalotti’s Lettere scientifiche ed erudite (1721) for it.
Magalotti, Lettere scientifiche ed erudite (1721)archive.org

The scanned first edition. The saying appears at p. 15 and again at p. 43, where Magalotti names Don Raffaello Magiotti as his informant.
Dante, Purgatorio XXV (Italian Wikisource)it.wikisource.org

Lines 77–78, the sun’s heat becoming wine when joined to the moisture that flows from the vine — the image Magalotti thinks Galileo took it from.
Wikipedia: Lorenzo Magalottien.wikipedia.org

The letter-writer: 1637–1712, secretary of the Accademia del Cimento, author of its Saggi di naturali esperienze, studied mathematics under Viviani.
Wikipedia: Raffaello Magiottien.wikipedia.org

The informant: 1597–1656, astronomer and physicist, in regular touch with Galileo from Rome and proposed to him in 1638 for the Pisa chair.
Wikiquote: Wineen.wikiquote.org

Where the modern English wording sits, as an uncited photo caption credited to Galileo — the shape in which it travels.

The author

About Galileo Galilei

Galileo Galilei

1564–1642 · Italian astronomer, physicist, engineer and polymath

Galileo Galilei was born in Pisa in 1564 and has been called the father of observational astronomy, of classical physics and of the scientific method. He turned a telescope on Jupiter and found moons, argued for the Copernican system in the Dialogue Concerning the Two Chief World Systems (1632), was condemned for it in 1633 and spent the rest of his life under house arrest, writing the Two New Sciences there. He also, on the evidence of one letter written down a generation later, liked to say that wine was a compound of moisture and light.

For writers & researchers

Cite this

The primary source (Chicago)

Lorenzo Magalotti, Lettere scientifiche ed erudite (Florence, 1721), 43: “Mi disse una volta il buon Don Raffaello Magiotti, che il Galileo era usato di dire, che il vino è un composto d’umore, e di luce.” The same saying also at p. 15. Reported speech, printed 79 years after Galileo’s death; no work of Galileo’s contains it.

This verification page

Quotle.info. “Who really said ‘Wine is sunlight, held together by water’?” Last verified 22 Aug 2026. https://quotle.info/who-said/wine-is-sunlight-held-together-by-water/

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