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What I have said may serve to recommend mathematics for acquiring a vigorous constitution of mind; for which purpose they are as useful as exercise is for procuring health and strength to the body.

John Arbuthnot (1701). “An Essay on the Usefulness of Mathematical Learning,: In a Letter from a Gentleman in the City to His Friend in Oxford..”, p.9
What I have said may serve to recommend mathematics for acquiring a vigorous constitution of mind; for which purpose they are as useful as exercise is for procuring health and strength to the body.