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Who really said it

Leave it as it is. You can not improve on it. The ages have been at work on it, and man can only mar it

Spoken by Theodore Roosevelt 1858–1919 · 26th President of the United States
Verified Free to reuse

Roosevelt said it at the Grand Canyon on 6 May 1903, and this exact wording is the one printed in the official text of the address in Presidential Addresses and State Papers, Part One (P. F. Collier & Son, New York, 1905), page 370. The reporter’s transcript of the speech as delivered carries the same thought in slightly different words — the second sentence there reads “Man cannot improve on it; not a bit.”

Last verified 4 Aug 2026 · how we verify · spot an error?

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“Leave it as it is. You can not improve on it. The ages have been at work on it, and man can only mar it” Theodore Roosevelt, address at the Grand Canyon, Arizona, 6 May 1903 — "Leave it as it is. You can not improve on it. The ages have been at work on it, and man can only mar it." Printed in The Works of Theodore Roosevelt: Presidential Addresses and State Papers, Part One (New York: P. F. Collier & Son, 1905), 370.

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In context

Evoking the world of Theodore Roosevelt — 26th President of the United States · conservationist. Theme: "Leave it as it is. You can not improve on it. The ages have been at work on it, and man can only mar it". 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.

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Minimalist editorial slide for the quote "Leave it as it is. You can not improve on it. The ages have been at work on it, and man can only mar it". 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

Where it comes from

Source
The Works of Theodore Roosevelt: Presidential Addresses and State Papers, Part One
Occasion
Address at Grand Canyon, Arizona, 6 May 1903
First published
P. F. Collier & Son, New York, 1905 — page 370
As delivered
The Coconino Sun (Flagstaff), 9 May 1903, p. 1 — “Man cannot improve on it; not a bit.”

I hope you will not have a building of any kind, not a summer cottage, a hotel, or anything else, to mar the wonderful grandeur, the sublimity, the great loneliness and beauty of the canyon. Leave it as it is. You can not improve on it. The ages have been at work on it, and man can only mar it. What you can do is to keep it for your children, your children’s children, and for all who come after you, as one of the great sights which every American if he can travel at all should see. Official text, p. 370

From the official printed version of the address. The newspaper transcript of the speech as delivered differs slightly, most visibly in the second sentence.

Scanned 1905 volume
Read the collected presidential addresses
Presidential Addresses and State Papers, Part One (1905), p. 370

How we verified it

Public domain

The wording quoted here is from a volume first published in 1905, so it is in the public domain in the United States. The book’s own front matter states that Roosevelt “retains no pecuniary interest” in the volumes and that the material in the addresses “has been dedicated to the public,” and is “not to be handled as copyrighted material.”

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

The wording, and the myths around it

This one is real — unusually so for a Roosevelt quotation. But the sentence you see quoted is the written version, and a good deal of folklore has grown up around the moment it was spoken.

The Coconino Sun, 9 May 1903 Different wording

The reporter’s transcript, published three days after the speech, has Roosevelt saying “Leave it as it is. Man cannot improve on it; not a bit. The ages have been at work on it and man can only mar it.” The familiar “You can not improve on it” is the official text. As one comparison of the two versions notes, Roosevelt ad-libbed liberally elsewhere, yet this passage is virtually identical between the two ↗.

“You cannot improve on it” Variant

The 1905 Collier printing sets it as two words, “can not.” Modern reproductions often close it up — the American Presidency Project ↗ prints “cannot.” The meaning is untouched, but the printed source has the two-word form.

Short-form quote cards Trimmed

The sentence is usually cut here. Roosevelt kept going: “What you can do is to keep it for your children, your children’s children, and for all who come after you, as one of the great sights which every American if he can travel at all should see.” The Theodore Roosevelt Center ↗ prints the full passage.

Roosevelt on a mule, Bright Angel Trail Wrong year

The Kolb Studio image almost always paired with this quote is dated 1911 ↗ — a later visit, not the 1903 trip that produced the speech. In 1903 he was at the canyon for roughly eight and a half hours and spoke from a hotel balcony to a crowd the newspaper put at about eight hundred.

“Roosevelt made the Grand Canyon a national park” Overstated

He proclaimed it a national monument on 11 January 1908. The Grand Canyon National Park Act ↗ was signed by Woodrow Wilson on 26 February 1919, after Roosevelt’s death on 6 January that year.

The quotation is authentic and precisely dated: Roosevelt, at the Grand Canyon, 6 May 1903, printed on page 370 of Presidential Addresses and State Papers, Part One ↗.

Context

Why it mattered

Roosevelt spent about eight and a half hours at the Grand Canyon on 6 May 1903 — part of a long western tour — and used a short speech to make an unusually blunt request of the people who lived there: do not build on the rim. The Santa Fe railroad had just decided against putting its hotel on the canyon’s edge, and he seized on that as the example to follow.

The line has become the shorthand for American preservation thinking, but its logic is worth noticing. Roosevelt does not argue that the canyon is useful, or profitable, or improvable. He argues that it is already finished — that time did the work, and that the only thing human hands can add is damage.

Leave it as it is. You can not improve on it.

What happened to the canyon afterwards

Roosevelt proclaimed the Grand Canyon a national monument on 11 January 1908, using the Antiquities Act. Full national park status came later: the Grand Canyon National Park Act was signed by President Woodrow Wilson on 26 February 1919, after Roosevelt’s death on 6 January of that year.

The irony was immediate. In the same issue of The Coconino Sun that carried the speech, a short item announced a new hotel to be built at the head of the Grand Canyon Mine Trail, and noted that the Santa Fe would go ahead with its own hotel because travel to the canyon had increased sharply.

Explore

Filed under

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

Humility Time Simplicity

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.

Presidential Addresses and State Papers, Part One (1905)archive.org

Scanned Collier volume containing the full Grand Canyon address; the quoted sentence is on page 370.
Two versions of the 1903 Grand Canyon speechkaibab.org

Side-by-side transcripts of the Coconino Sun report and the official printed text, with notes on the differences.
Theodore Roosevelt Center — the quotationtheodorerooseveltcenter.org

Dickinson State University’s TR Center prints the full sentence and dates it to 6 May 1903 at the Grand Canyon.
Remarks at Grand Canyon, Arizonapresidency.ucsb.edu

The American Presidency Project’s text of the same remarks, rendering the second sentence as “You cannot improve on it.”
Grand Canyon National Parken.wikipedia.org

Chronology of the 1908 national monument proclamation and the 1919 national park act.
Theodore Roosevelten.wikipedia.org

Biography with birth and death dates and his 1901–1909 presidency.

The man who said it

About Theodore Roosevelt

Theodore Roosevelt

1858–1919 · 26th President of the United States · conservationist

Theodore Roosevelt (born 27 October 1858, died 6 January 1919) was the 26th President of the United States, serving from 1901 to 1909. He was also a rancher, soldier, naturalist and prolific author, and conservation was the cause he pressed hardest from office. He proclaimed the Grand Canyon National Monument on 11 January 1908, five years after standing in Arizona and asking a crowd to leave the canyon alone.

For writers & researchers

Cite this

Primary source

Roosevelt, Theodore. “At Grand Canyon, Arizona, May 6, 1903.” In The Works of Theodore Roosevelt: Presidential Addresses and State Papers, Part One, 370. New York: P. F. Collier & Son, 1905. As-delivered transcript: The Coconino Sun (Flagstaff, Arizona), 9 May 1903, p. 1.

This verification page

Quotle.info. “Who really said ‘Leave it as it is. You can not improve on it. The ages have been at work on it, and man can only mar it’?” Last verified 4 Aug 2026. https://quotle.info/who-said/leave-it-as-it-is-you-can-not-improve-on-it-the-ages-have/

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