Plato’s argument is supposed to be an early example of a so-called genetic fallacy since his conclusion arises from his famous lodestone (magnet) analogy. Ion, the rhapsode “dangles like a lodestone at the end of a chain of lodestones. The muse inspires the poet (Homer in Ion’s case) and the poet inspires the rhapsode.” Plato’s dialogues are themselves “examples of artistry that continue to be stageworthy;” it is a paradox that “Plato the supreme enemy of art is also the supreme artist.”
In Plato's Ion Socrates discusses with Ion, a professional rhapsode who also lectures on Homer, the question of whether the rhapsode, a performer of poetry, gives his performance on account of his skill and knowledge or by virtue of divine possession. It is one of the shorter of Plato's dialogues.
ION: Very true, Socrates; interpretation has certainly been the most laborious part of my art; and I believe myself able to speak about Homer better than any man; and that neither Metrodorus of Lampsacus, nor Stesimbrotus of Thasos, nor Glaucon, nor any one else who ever was, had as good ideas about Homer as I have, or as many.