Heraclitus Quote

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

On the Universe, 41. See also Everything flows and nothing...
"On the Universe" is one of three discourses from "On Nature".
As with other pre-Socratics, Heraclitus writings only survive in fragments quoted by other authors.

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

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

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

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