Apophthegmata Laconica
Plutarch
Plutarch. Moralia, Vol. III. Babbitt, Frank Cole, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1931 (printing).
When one of his friends blamed him because he spoke ill of a certain physician, although he had never had anything to do with him, and had not suffered any harm at his hands, he said, Because if I had ever had anything to do with him I should not now be alive.
When the physician said to him, You have lived to be an old man, he said, That is because I never employed you as my physician.
He said that the best physician was the man who did not allow his patients to rot, but buried them quickly.