Full Idea
You can bathe in the same river twice, but not in the same river stage.
Gist of Idea
You can bathe in the same river twice, but not in the same river stage
Source
comment on Heraclitus (fragments/reports [c.500 BCE]) by Willard Quine - Identity, Ostension, and Hypostasis 1
Book Reference
Quine,Willard: 'From a Logical Point of View' [Harper and Row 1963], p.65
A Reaction
This seems to make Quine a 'perdurantist', committed to time-slices of objects, rather than whole objects enduring through change.