Who really said it

Mistakes are the portals of discovery

Not James Joyce — a Popular Paraphrase James Joyce 1882–1941 · Irish novelist & poet

Disputed Free to reuse

The idea is genuinely Joyce’s, but this exact sentence is not. In Ulysses (1922), Stephen Dedalus actually says: “A man of genius makes no mistakes. His errors are volitional and are the portals of discovery.” The popularized one-liner strips out “a man of genius” and “volitional,” turning a specific claim about deliberate error into a generic inspirational maxim — a truncation confirmed by Joyce scholarship as a long-standing misquotation.

Last verified 8 Jul 2026 · how we verify · spot an error?

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Disputed — copy with the correction

“Mistakes are the portals of discovery” James Joyce, Ulysses (paraphrased)

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Provenance

The source

Work: Ulysses
Episode: Episode 9, “Scylla and Charybdis”
Published: 1922 · Sylvia Beach / Shakespeare and Company, Paris
Speaker: Stephen Dedalus, in debate over Shakespeare’s marriage

Bosh! Stephen said rudely. A man of genius makes no mistakes. His errors are volitional and are the portals of discovery. ULYSSES · EPISODE 9

This is Stephen Dedalus’s actual line, spoken during the Shakespeare debate in the library episode — not the shortened, generic version usually quoted.

Full text (public domain)

Ulysses on Project Gutenberg

Ulysses (novel) on Wikiquote

How we verified this

The full, correct line — “A man of genius makes no mistakes. His errors are volitional and are the portals of discovery” — is documented as spoken by Stephen Dedalus in Episode 9 on Wikiquote’s Ulysses page ↗.
Joyce scholar Sam Slote traces how the truncated “Mistakes are the portals of discovery” was for years listed inaccurately on Wikiquote before correction, and notes it has “succumbed to further misquotation” elsewhere — including a Dublin pub façade rendering it as “A man’s errors are his portals of discovery,” per his OUPblog essay ↗.
The novel itself was first published in 1922 in Paris, per its Project Gutenberg edition ↗, which is based on pre-1923 print editions and is in the public domain in the United States.

Public domain

“Ulysses” was first published in 1922 in Paris and its text is in the public domain in the United States, so the underlying passage carries no US copyright restriction.

Fact-check

A Popular Trim, Not a Fabrication

Joyce really did write about errors being “portals of discovery” — but not in the compact, universal form now plastered on posters and mugs.

Popular internet quote culture Truncated

Websites and quote-image generators dropped “a man of genius” and “volitional,” per Sam Slote’s OUPblog essay ↗, turning a specific claim about a genius’s deliberate errors into a generic self-help maxim about mistakes in general.

Wikiquote (formerly) Since corrected

The truncated line was, for a period, listed on Wikiquote as if it were Joyce’s actual wording before being corrected, per the same OUPblog account ↗.

Stephen Dedalus’s real line in Episode 9 of Ulysses ↗ is “A man of genius makes no mistakes. His errors are volitional and are the portals of discovery” — a claim about a genius’s deliberate errors, not a blanket statement that all mistakes lead to discovery.

Context

Why it mattered

The line comes from the “Scylla and Charybdis” episode of Ulysses, set in the National Library of Ireland, where Stephen Dedalus holds forth on Shakespeare to a skeptical audience including John Eglinton. When Eglinton suggests Shakespeare’s marriage was simply a mistake, Stephen retorts that a man of genius makes no mistakes — his errors are willed, and become gateways to new work.

Stripped of that argumentative context, the line has drifted into a stand-alone motivational quote, credited to Joyce broadly but rarely traced back to the specific claim he was actually making about artistic genius and deliberate error.

His errors are volitional and are the portals of discovery.

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Filed under

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

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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.

Ulysses (novel) — Wikiquoteen.wikiquote.org

Lists the correct Episode 9 line and its speaker

“A man of genius makes no mistakes”: Joycean misapprehensionsblog.oup.com

Oxford University Press blog essay by Joyce scholar Sam Slote on the misquotation's history

Ulysses, by James Joycegutenberg.org

Full public-domain text of the 1922 novel

James Joyceen.wikipedia.org

Biographical overview of the author

The author

About James Joyce

James Joyce

1882–1941 · Irish novelist & poet

James Joyce was an Irish modernist writer whose novel Ulysses (1922) redefined the possibilities of the English novel through stream-of-consciousness narration and dense literary allusion. He also wrote Dubliners, A Portrait of the Artist as a Young Man, and Finnegans Wake, and is widely regarded as one of the most influential writers of the twentieth century.

For writers & researchers

Cite this

The primary source (Chicago)

Joyce, James. Ulysses. Paris: Sylvia Beach, 1922. Episode 9, “Scylla and Charybdis” (spoken by Stephen Dedalus).

This verification page

Quotle.info. “Who really said ‘Mistakes are the portals of discovery’?” Last verified 8 Jul 2026. https://quotle.info/who-said/mistakes-are-the-portals-of-discovery