The Republic · Rep. 400a

But, indeed, he replied, I cannot tell you. I only know that there are some three principles of rhythm out of which metrical systems are framed, just as in sounds there are four notes out of which all the harmonies are composed; that is an observation which I have made. But of what sort of lives they are severally the imitations I am unable to say.

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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