The Republic · Rep. 394e

Then, Adeimantus, let me ask you whether our guardians ought to be imitators; or rather, has not this question been decided by the rule already laid down that one man can only do one thing well, and not many; and that if he attempt many, he will altogether fail of gaining much reputation in any?

Plato · translated by Benjamin Jowett · composite transcription based on the 1888 third edition
Benjamin Jowett, revised third edition (1888), with Stephanus numbering from the 1908 edition; composite transcription, Project Gutenberg #55201
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