The Republic · Rep. 556e–557a

And, as in a body which is diseased the addition of a touch from without may bring on illness, and sometimes even when there is no external provocation a commotion may arise within—in the same way wherever there is weakness in the State there is also likely to be illness, of which the occasion may be very slight, the one party introducing from without their oligarchical, the other their democratical allies, and then the State falls sick, and is at war with herself; and may be at times distracted, even when there is no external cause.

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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