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Who really said it

Genius is one percent inspiration, ninety-nine percent perspiration

Spoken by Thomas Edison 1847–1931 · American inventor and businessman; 1,093 US patents
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This one is real. The exact 1-to-99 wording was in print credited to Edison by 6 May 1901, appears as “his historic remark” in Dyer and Martin’s 1910 biography, and Edison claimed it in his own words — in a 1927 letter and again in a September 1932 Harper’s Monthly interview. What is not documented is the day he first said it.

Last verified 7 Aug 2026 · how we verify · spot an error?

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“Genius is one percent inspiration, ninety-nine percent perspiration” Thomas Edison — "Genius is one percent inspiration, ninety-nine percent perspiration." Documented as "Genius is 1 per cent. inspiration and 99 per cent. perspiration" in Frank Lewis Dyer and Thomas Commerford Martin, Edison: His Life and Inventions (New York: Harper & Brothers, 1910), p. 607. The 1-to-99 wording appears in print credited to Edison as early as 6 May 1901, and Edison claimed it himself in a 1927 letter. Verified at quotle.info.

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Provenance

Where the line is documented

Documented in
Edison: His Life and Inventions
Authors & date
Frank Lewis Dyer and Thomas Commerford Martin; New York: Harper & Brothers, 1910, p. 607
Earliest 1-to-99 printing
Idaho Daily Statesman, 6 May 1901, p. 4 — located by Barry Popik, per Quote Investigator
Edison’s own claim
Letter, 1927 (printed in the Argus Leader, 21 February 1932); repeated in Harper’s Monthly, September 1932, p. 406

The idea of attributing great successes to “genius” has always been repudiated by Edison, as evidenced by his historic remark that “Genius is 1 per cent. inspiration and 99 per cent. perspiration.” Dyer & Martin, 1910

The 1910 text uses the period spelling “1 per cent.” and “99 per cent.”; the familiar modern form is a later normalisation. This passage was read directly in the Project Gutenberg transcription.

Digitised book, 1910
Read the passage in Dyer and Martin’s biography
Quote Investigator: the full 1892–1932 chronology

How we traced it

  • Quote Investigator ↗ assembled the dated chronology and concluded that although the inspiration/perspiration idea was already circulating, “Edison can be credited with presenting a clever fractional breakdown,” and that it is reasonable to credit him with the 1-to-99 version.
  • The earliest printing of the 1-to-99 wording that Quote Investigator located, found by researcher Barry Popik, is an item headed “Doing One’s Best” in the Idaho Daily Statesman of 6 May 1901, page 4. Wikiquote records the same report and notes it came from an address by the Unitarian minister George N. Falconer. Wikiquote ↗
  • We read the 1910 biography ourselves rather than trusting a quotation site: the Project Gutenberg transcription of Edison: His Life and Inventions contains the sentence verbatim, introduced as Edison’s “historic remark.” Full text at Project Gutenberg ↗
  • Edison himself confirmed it. Wikiquote cites a 1927 letter — “it is quite true I once made the statement that genius is one percent inspiration and 99 percent perspiration, and I am still of the same opinion” — printed in the Argus Leader of 21 February 1932, and M. A. Rosanoff’s “Edison in his Laboratory” in Harper’s Magazine, September 1932 ↗, page 406.
Public domain

The wording is documented in Dyer and Martin’s Edison: His Life and Inventions, first published in 1910 by Harper & Brothers and long out of copyright in the United States — the full text is free at Project Gutenberg ↗. The later works in which Edison restates the line, including the September 1932 Harper’s Monthly article, are separate publications and are not covered by that public-domain status.

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

What actually gets muddled

The attribution holds — this is one of the famous lines that really is Edison’s. What goes wrong is the arithmetic and the ancestry: he used a different ratio first, and the underlying wordplay was already circulating before he ever attached numbers to it.

Thomas Edison, at 98 to 2 His own earlier version

In April 1898 the Ladies’ Home Journal printed Edison’s reply that “Two per cent. is genius, and 98 per cent. is hard work,” and 2-to-98 versions kept appearing into 1904. Anyone quoting a 98 percent figure is quoting Edison too — just the earlier draft. Quote Investigator ↗

Kate Sanborn Wordplay, no numbers

Newspapers of 1891–1893 credited the American author and lecturer Kate Sanborn with inspiration/perspiration formulations such as “No inspiration without perspiration” and “Genius is inspiration, talent is perspiration” — the pun, but never the percentages. Wikiquote’s precursor list ↗

Anonymous Pre-dates Edison’s numbers

Wikiquote records an 1881 San Francisco Examiner aphorism, “A poet’s inspiration is most frequently an editor’s perspiration,” and an 1895 Wichita Eagle line, “Genius and adaptability is one per cent. Hard work is 99 per cent” — neither credited to anybody. See the citations ↗

Buffon, Carlyle and Ruskin Same idea, different sentence

Phrases.org.uk points to Buffon on genius as “a greater aptitude for patience,” Carlyle on capacity for taking trouble, and Ruskin’s 1878 “I know of no genius but the genius of hard work.” None of them is the source of Edison’s sentence. Phrases.org.uk ↗

Edison claimed the line himself — in a 1927 letter (“it is quite true I once made the statement…”) and again in September 1932 — and Quote Investigator ↗ concludes it is reasonable to credit him with the 1-to-99 version, while noting the inspiration/perspiration idea was already in circulation.

Context

Why he said it

Edison was not writing a motivational poster; he was pushing back. The 1910 biography introduces the line by observing that the idea of attributing great successes to “genius” had always been repudiated by Edison — the ratio was his way of refusing the wizard label the press kept hanging on him. Read that way, the sentence is less about effort being admirable and more about insight being cheap: the idea is the easy part, and the arithmetic is the joke.

The numbers took a while to settle. In April 1898 the Ladies’ Home Journal had Edison saying “Two per cent. is genius, and 98 per cent. is hard work,” and versions of the 2-to-98 split kept circulating for years, including in Scientific American in 1902 and the Chicago Tribune in 1904, according to Quote Investigator ↗. The 1-to-99 form appears in print in 1901 and is the one that stuck.

Bah! Genius is not inspired. Inspiration is perspiration.

Why the percentages keep moving

Edison demonstrably used more than one ratio in public, and papers of the period printed several unattributed variants alongside them. Quote Investigator records a 98-to-2 split in April 1898, a 2-to-98 version in Scientific American in 1902 and in the Chicago Tribune in 1904, and the 1-to-99 version from 1901 onward.

Wikiquote adds further period wordings: a May 1898 Northwestern Christian Advocate item crediting Edison with the saying that “genius is ninety percent perspiration,” and an unattributed 1899 Tacoma Daily Ledger advertisement offering “Genius is three per cent. inspiration and ninety-seven per cent. perspiration.” See the Wikiquote entry ↗ for the citations.

A 1929 press-conference version recorded in James D. Newton’s Uncommon Friends (1987) has Edison putting it as: “None of my inventions came by accident… What it boils down to is one per cent inspiration and ninety-nine percent perspiration.”

Explore

Filed under

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

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Go further

Dig deeper

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

Quote Investigator: the full chronologyquoteinvestigator.com

Traces every dated version from Kate Sanborn’s 1890s wordplay through Edison’s 2-to-98 and 1-to-99 ratios, and concludes it is reasonable to credit Edison with the modern saying.
Wikiquote: Thomas Edisonen.wikiquote.org

Files the line in its sourced section and cites Edison’s 1927 letter, the September 1932 Harper’s Monthly interview, the 1901 Idaho Statesman report, and a list of precursors from 1881 onward.
Edison: His Life and Inventions (1910), full textgutenberg.org

The Dyer and Martin biography that prints the line as Edison’s “historic remark” — free and out of copyright in the United States.
Harper’s Magazine, September 1932archive.org

Scan of the issue (vol. 165, no. 987) that Wikiquote cites at p. 406 for M. A. Rosanoff’s account of Edison repeating the line himself. Access-restricted lending item.
Thomas Edisonen.wikipedia.org

Biography confirming his dates, his 1,093 US patents, and that he grew to resent being called a genius, emphasising instead “one percent inspiration and 99 percent perspiration.”
Phrases.org.uk: meaning and originphrases.org.uk

A more sceptical write-up that lists older cousins of the thought from Buffon, Carlyle and Ruskin. Note it treats the 1932 Harper’s piece as the first record and predates the 1901 finding.

The man who hated being called a genius

Who was Thomas Edison?

Thomas Edison

1847–1931 · American inventor and businessman

Thomas Alva Edison was an American inventor and businessman known for his work on the incandescent light bulb, the phonograph, electric power distribution and early motion pictures, and he registered 1,093 patents in the United States. He industrialised invention itself, running laboratories where discovery was a salaried, systematic grind rather than a flash of insight. As he aged he resented being described as a genius — which is precisely the sentiment this line was built to deflate.

For writers & researchers

Cite this

Primary source

Frank Lewis Dyer and Thomas Commerford Martin, Edison: His Life and Inventions (New York: Harper & Brothers, 1910), 607. Earliest printing of the 1-to-99 wording located by Quote Investigator: “Doing One’s Best,” Idaho Daily Statesman (Boise), 6 May 1901, 4.

This verification page

Quotle.info. “Who really said ‘Genius is one percent inspiration, ninety-nine percent perspiration’?” Last verified 7 Aug 2026. https://quotle.info/who-said/genius-is-one-percent-inspiration-ninety-nine-percent/

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