Over on Skeptics, Laurel found some partial information in a quote from Mathematics as a culture clue and other essays:
I once quoted that mot to a poet, and got the quick response: "Poetry is the art of giving different names to the same thing."
Do we know which poet?
The mot was made by mathematician Poincaré: "Mathematics is the art of giving the same name to different things."
Follow up: Is poetry the art of giving different names to the same thing?