The Republic · Rep. 352a

And is not injustice equally fatal when existing in a single person; in the first place rendering him incapable of action because he is not at unity with himself, and in the second place making him an enemy to himself and the just? Is not that true, Thrasymachus?

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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