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It is not so much whether a theorem is useful that matters, but how elegant it is.

Stanislaw Ulam
Matter, Theorems, Elegant
"Adventures of a Mathematician". Book by Stanislaw Ulam, 3rd edition. Chapter 15: "Random Reflections on Mathematics and Science", p. 274, 1991.
It is not so much whether a theorem is useful that matters, but how elegant it is.