| The Columbia World of Quotations. 1996. |
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| NUMBER: | 27895 |
| QUOTATION: | It is impossible to step into the same river twice. |
| ATTRIBUTION: | Heraclitus (c. 535475 B.C.), Greek philosopher. Diels-Kranz, fr. 91 (from Plutarch).
Heraclitus, one of the two or three most influential philosophers before Socrates, was known as the riddler or the obscure. |
| BIOGRAPHY: | Columbia Encyclopedia. |
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| | | The Columbia World of Quotations. Copyright © 1996 Columbia University Press. |
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