"It is the duty of a great person so to demean himself, as that whatever endowments he may have, he may appear to value himself upon no qualities but such as any man may arrive at."

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I believe in intelligence, and I believe also that there are inherited differences in intellectual ability, but I do not believe that intelligence is a simple scalar endowment that can be quanitified by attaching a single figure to it—an I.Q. or the like.

— Peter Medawar