J. J. Sylvester, at a commencement address at Johns Hopkins University, gave his view on the relation between teaching and research: “An eloquent mathematician must, from the nature of things, ever remain as rare a phenomenon as a talking fish, and it is certain that the more anyone gives himself up to the study of oratorial effect, the less he will find himself in a fit state of mind to mathematicize.”
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James Joseph Sylvester