Carnegie genuinely loved this line and had it carved into the mantels of his own libraries — but he did not write it. Quote Investigator ↗ traces the wording to the closing lines of William Drummond’s preface to Academical Questions (1805), where it reads “he, who will not reason, is a bigot; he, who cannot, is a fool; and he, who dares not, is a slave.” Word for word, that is the line still in circulation.
“He who will not reason is a bigot; he who cannot is a fool; and he who dares not is a slave” He who will not reason is a bigot; he who cannot is a fool; and he who dares not is a slave. — William Drummond, Academical Questions, vol. 1 (London, 1805), preface, pp. xiv–xv. Commonly misattributed to Andrew Carnegie, who had a variant of the line carved on his library mantels but named no author, and earlier to Lord Byron, who quoted it and credited Drummond. Provenance: quotle.info Verbatim: “Philosophy, wisdom, and liberty, support each other; he, who will not reason, is a bigot; he, who cannot, is a fool; and he, who dares not, is a slave.”
⚠ The slide-ready mistake: crediting this to Andrew Carnegie. Use the credit shown above instead.
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Provenance
The 1805 preface it actually closes
Work
Academical Questions, Volume 1
Author
William Drummond
Passage
Preface, pp. xiv–xv
First published
London, 1805
Philosophy, wisdom, and liberty, support each other; he, who will not reason, is a bigot; he, who cannot, is a fool; and he, who dares not, is a slave.
Drummond’s sentence is word-for-word the line that circulates today — only his commas and the opening capital have been smoothed away. The wording and the page reference are as Quote Investigator transcribes the 1805 preface ↗.
1819 — an edition of Childe Harold’s Pilgrimage carries a note to Canto IV, stanza CXXVII that reproduces Drummond’s preface and cites it by page and volume. Byron borrowed the line and pointed readers to its author; Quote Investigator transcribes the note’s source reference ↗.
1920 — Andrew Carnegie’s autobiography, published the year after his death, describes a marble mantel in Mr. Stokes’s library carved with an open book and a variant of the words. Carnegie names no author, and writes that they now grace his own mantels: “And so they do in New York and Skibo to-day” ↗.
✓Public domain
The line first appeared in William Drummond’s Academical Questions, published in London in 1805 — written in English and far outside any surviving US copyright term, so the text is firmly public domain. The mantel-inscription variant comes from Carnegie’s Autobiography (London: Constable, 1920), which is public domain in the United States as well; Project Gutenberg distributes it in full ↗.
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
Two men got the credit; neither wrote it
This is not a fabricated quote. The wording is genuine and it is more than two centuries old — what travelled wrongly is the name attached to it, and it went wrong twice, in two different centuries, for two different reasons.
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The credit you see todayAndrew Carnegie Popularised it, didn’t write it
In his autobiography Carnegie describes visiting a friend’s home as a young telegraph operator and being thrilled by a marble library mantel carved with an open book bearing the words. He vowed to have a library of his own with the same inscription, and records that he did, in New York and at Skibo ↗ — naming no author anywhere in the passage. Quote Investigator adds that he encouraged libraries he funded to display the saying ↗. Once the motto was on the walls of Carnegie libraries, the man who paid for the walls inherited the byline.
✕
The older, wider errorLord Byron In print by 1833
Byron quoted the passage in a note to Childe Harold’s Pilgrimage and cited Drummond’s preface by page and volume — but readers took the line and left the citation behind. Quote Investigator finds the confusion in print by 1833 ↗, and quote sites still carry a smoother plural version of the line under Byron’s name.
Academical Questions was a work of philosophical scepticism, and this sentence is the last thing a reader meets before the argument begins. Its force is in the structure: three ways of failing to think, each with its own diagnosis. The man who will not reason has chosen his conclusion in advance. The man who cannot is merely unequipped. The man who dares not has someone standing over him — which makes the failure political rather than personal, and turns a remark about logic into a remark about liberty.
That civic edge is why the line ended up carved in stone rather than quoted in seminars. Carnegie, then a young telegraph operator, saw it on a rich man’s library mantel and read it as a promise about what a library is for. He put it on his own mantels, and from there it spread across a philanthropic empire of reading rooms — carrying his name instead of Drummond’s, because a motto on a wall rarely comes with a footnote.
he, who will not reason, is a bigot; he, who cannot, is a fool; and he, who dares not, is a slave
The three competing wordings
On the wording. Three forms circulate. Drummond’s original is the singular, heavily punctuated one, opening with “Philosophy, wisdom, and liberty, support each other.” The popular modern form is the same sentence with the commas removed. A third, plural form beginning “Those who will not reason, are bigots” is usually filed under Byron’s name on quote sites.
The Carnegie variant is different again. The mantel inscription he transcribes reorders the clauses and compresses them — cannot/fool first, will not/bigot second, dare not/slave third — which is a good sign it reached the marble carver by memory or through an intermediary, not from a copy of the 1805 preface.
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Filed under
More provenance-checked quotes on the same theme, each with its reuse status.
1769–1828 · Scottish diplomat, MP and sceptical philosopher
William Drummond of Logiealmond was baptised in September 1769 and died in March 1828, and spent his working life in politics and diplomacy rather than philosophy: MP for St Mawes and then Lostwithiel, envoy to Naples, and briefly ambassador to the Ottoman Empire. His serious intellectual work was done alongside all that, and Academical Questions (1805) is the book that matters here — a defence of philosophical scepticism in the line of David Hume, and a text that helped shape the young Percy Bysshe Shelley. He was a Fellow of the Royal Societies of both London and Edinburgh, and is now remembered almost entirely for one sentence in that book’s preface — a sentence that usually appears under somebody else’s name.
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Cite this
Primary source
William Drummond, Academical Questions, vol. 1 (London, 1805), preface, xiv–xv, as documented in “Quote Origin: He, Who Will Not Reason, Is a Bigot; He, Who Cannot, Is a Fool; and He, Who Dares Not, Is a Slave,” Quote Investigator, September 25, 2018. For the Carnegie connection: Andrew Carnegie, Autobiography of Andrew Carnegie, ed. John C. Van Dyke (London: Constable, 1920), 82.
This verification page
Quotle.info. “Who really said ‘He who will not reason is a bigot; he who cannot is a fool; and he who dares not is a slave’?” Last verified 30 Jul 2026. https://quotle.info/who-said/he-who-will-not-reason-is-a-bigot-he-who-cannot-is-a-fool/