The Republic · Rep. 588e–589a

And now, to him who maintains that it is profitable for the human creature to be unjust, and unprofitable to be just, let us reply that, if he be right, it is profitable for this creature to feast the multitudinous monster and strengthen the lion and the lion-like qualities, but to starve and weaken the man, who is consequently liable to be dragged about at the mercy of either of the other two; and he is not to attempt to familiarize or harmonize them with one another—he ought rather to suffer them to fight and bite and devour one another.

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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