The Republic · Rep. 590c–590d

And therefore, being desirous of placing him under a rule like that of the best, we say that he ought to be the servant of the best, in whom the Divine rules; not, as Thrasymachus supposed, to the injury of the servant, but because every one had better be ruled by divine wisdom dwelling within him; or, if this be impossible, then by an external authority, in order that we may be all, as far as possible, under the same government, friends and equals.

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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