"Perhaps five or even ten per cent of men can do something rather well. It is a tiny minority who can do anything really well, and the number of men who can do two things well is negligible. If a man has any genuine talent, he should be ready to make almost any sacrifice in order to cultivate it to the full."
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Source : G. H. Hardy (2012). “A Mathematician's Apology”, p.68, Cambridge University Press
Source : William Goldman (2013). “The Princess Bride: An Illustrated Edition of S. Morgenstern's Classic Tale of True Love and High Adventure”, p.185, Houghton Mifflin Harcourt