"You cannot step in the same river twice"
The water moves on, and by your second step both the river and you have changed. The line became the eternal emblem of "everything flows" and a headwater of Western dialectic.
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Heraclitus
Greek philosopher of universal flux
Those Who Ground an Idea Into a Whole System · Disciples & School-Builders
FluxLogosUnity of opposites
Who they are
Heraclitus (c. 535–475 BC), the Ionian philosopher of change, held that "you cannot step into the same river twice": all things flow, fire is the primal element, and order (logos) lives in the tension of opposites. His riddling aphorisms earned him the name "the Obscure" and shaped dialectical thought from Plato to Hegel.
Primary sourcesDiels–Kranz, Fragments of the PresocraticsPlato, Cratylus
Key stories
Relationships
Disciple
Echoes today
Below are how modern works borrow or reinterpret this name or story — not the original material. The two differ, so keep them apart.
"Everything flows"A common phrase for constant change, and the headwater Hegel claimed for dialectic.