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Who really said it

You could not step twice into the same river; for other waters are ever flowing on to you

Attributed to Heraclitus c. 540 – c. 480 BCE · Pre-Socratic philosopher of Ephesus
Attributed Free to reuse

Genuinely Heraclitus in substance — the ever-flowing river is his signature image for a world in constant change — but this exact one-sentence form is Plato’s paraphrase in the Cratylus (402a), here in a public-domain 19th-century English translation. Heraclitus’s one securely genuine river fragment (DK B12) actually reads “other and other waters flow” on those who step in — not “you could not step twice.”

Last verified 10 Jul 2026 · how we verify · spot an error?

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“You could not step twice into the same river; for other waters are ever flowing on to you” You could not step twice into the same river; for other waters are ever flowing on to you. — attributed to Heraclitus; the exact wording is Plato's paraphrase (Cratylus 402a), and Heraclitus's genuine fragment B12 reads differently

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Provenance

The river fragment

Ascribed to
Heraclitus of Ephesus
Earliest source
Plato, Cratylus 402a
Genuine fragment
Heraclitus, DK 22 B12
Translation
Public-domain English rendering (Bywater Greek text, late 19th c.)

“Heraclitus, I believe, says that all things pass and nothing stays, and comparing existing things to the flow of a river, he says you could not step twice into the same river.” Plato paraphrasing Heraclitus, Cratylus 402a

That is Plato’s summary. Heraclitus’s own securely genuine river fragment (DK B12) reads instead: “on those stepping into rivers staying the same, other and other waters flow.” The neat “step twice” sentence — and the popular “other waters are ever flowing on to you” tail — is the later, condensed form.

Stanford Encyclopedia of Philosophy: Heraclitus

How we verified this

  • Our earliest source is Plato: in the Cratylus (c. 360 BCE, 402a) Socrates reports that Heraclitus “says you could not step twice into the same river” — the single-sentence form everyone quotes is Plato’s condensation, not a surviving line of Heraclitus’s own.
  • Heraclitus’s one certifiably genuine river fragment (DK B12), preserved through later writers, actually reads “on those stepping into rivers staying the same, other and other waters flow” — and scholars (Marcovich 1967) argue the “step twice” versions come from a misreading of it, per the Stanford Encyclopedia of Philosophy.
  • The exact English wording — “other waters are ever flowing on to you” — is a public-domain late-19th-century translation reproduced on Wikiquote; John Burnet’s contemporaneous rendering has “fresh waters are ever flowing in upon you,” as printed in the annotated fragments.
Public domain

The underlying Greek — Plato’s Cratylus and Heraclitus’s fragments — has been in the public domain for millennia, and the specific English wording here is a public-domain translation first printed in the late 19th century, well before 1931. No modern rights attach to this phrasing.

This reflects the original work, which is public domain. If your exact English wording comes from a specific modern translation, that translation may itself still be under copyright — check the edition you quote.

Fact-check

What gets blurred

The attribution to Heraclitus is essentially right — the flux doctrine and the river are genuinely his. What gets blurred is whose exact words these are and which river line Heraclitus actually wrote.

Plato’s paraphrase, not Heraclitus verbatim paraphrase

The tidy “you could not step twice into the same river” sentence is Plato’s summary of Heraclitus in the Cratylus 402a, not a line from Heraclitus’s own book. His one certifiably genuine river fragment (B12) says “other and other waters flow,” per the Stanford Encyclopedia of Philosophy.

a much later embellishment expanded add-on

This popular expanded version appears in none of the ancient sources; it is a modern paraphrase pinned onto Heraclitus, unlike the terse genuine fragments collected on Wikiquote.

later doxographers not his phrase

The famous tag panta rhei does not appear in Heraclitus’s own fragments; it is a later label for his philosophy, as noted on Wikiquote.

Real doctrine, real philosopher — but the crisp “step twice” wording is Plato’s paraphrase, and Heraclitus’s own surviving river line (B12) reads differently. See the Stanford Encyclopedia of Philosophy.

Context

Why it mattered

Heraclitus’s river is one of the oldest and most quoted images in Western thought — a one-line argument that identity itself is unstable, because the thing you name (a river, a self) is really a process that never holds still. It seeded debates about change, persistence, and identity that run from Plato through Hegel to modern philosophy of time.

Ironically, the version everyone remembers is the one Plato used to caricature Heraclitus — sharpening “other and other waters flow” into “you could not step twice” to portray him as denying stable knowledge altogether.

You could not step twice into the same river.

The three river fragments — and which one is genuine

Scholars distinguish three ‘river’ fragments: B12 (“other and other waters flow”), B49a (“into the same rivers we step and do not step”), and B91a (“it is not possible to step twice into the same river”). Only B12 has the linguistic density typical of Heraclitus; the “step twice” versions may derive, per Marcovich (1967), from a misreading of B12 — the very reading Plato popularized. See the Stanford Encyclopedia of Philosophy.

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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.

Heraclitusen.wikiquote.org

Sourced fragments, including this exact wording under the Cratylus section and the genuine B12 fragment.
Heraclitusplato.stanford.edu

Scholarly analysis of the three river fragments (B12, B49a, B91a) and why only B12 is certifiably genuine.
Fragments of Heraclitus (annotated)en.wikisource.org

John Burnet's public-domain translation with fragment numbers; the river fragment is (41, 42)/B12.
The Fragments of the Work of Heraclitus of Ephesus on Nature (Patrick, 1889)archive.org

G. T. W. Patrick's public-domain 1889 English translation from Bywater's Greek text — the family of renderings behind the popular wording.
Fragments of Heraclituslibarynth.org

Side-by-side fragment translations useful for comparing the river-fragment wordings.

The author

About Heraclitus

Heraclitus

c. 540 – c. 480 BCE · Pre-Socratic philosopher of Ephesus

Heraclitus of Ephesus was a Pre-Socratic Greek philosopher active around 500 BCE, remembered for his doctrine that reality is in ceaseless change, held together by the logos. He wrote a single book, now lost; roughly a hundred cryptic fragments survive only as quotations in later authors, earning him the nickname “the Obscure.” The river — into which fresh water is always flowing — became his defining image for a world in permanent flux.

For writers & researchers

Cite this

Primary source — Chicago

Plato, Cratylus 402a, where Socrates reports Heraclitus’s river doctrine; cf. Heraclitus, fragment DK 22 B12. Popular English wording from a public-domain late-19th-century translation of Bywater’s Greek text, as reproduced on Wikiquote.

MLA (9th ed.)

Plato. Cratylus. Translated anonymously from Ingram Bywater’s Greek text, late 19th century, sec. 402a.

APA (7th ed.)

Plato. (ca. 1880–1899). Cratylus (Anonymous, Trans.). (Original work published ca. 360 BCE)

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Quotle.info. “Who really said ‘You could not step twice into the same river; for other waters are ever flowing on to you’?” Last verified 10 Jul 2026. https://quotle.info/who-said/you-could-not-step-twice-into-the-same-river-for-other

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