The Republic · Rep. 411b–411c

If the element of spirit is naturally weak in him the change is speedily accomplished, but if he have a good deal, then the power of music weakening the spirit renders him excitable;—on the least provocation he flames up at once, and is speedily extinguished; instead of having spirit he grows irritable and passionate and is quite impracticable.

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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