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Pletho, a neo-pagan, had an ulterior motive in pitting Plato against Aristotle. As an opponent of the proposed union between the Latins and the Greeks, he hoped to demolish the intellectual edifice of the Roman Catholic Church, which he quite rightly recognized had been raised, thanks to Aquinas and others, on Aristotelian foundations. Upending the traditional philosophical hierarchy, he depicted Aristotle as an atheist while stressing Plato’s piety. He pointed out that for Aristotle the Prime Mover—the primary cause of all motion in the universe—existed in only one celestial sphere, which undermined the Christian idea of a god who dwells in all things. He rebutted Aristotle’s attack on Forms by saying it was tantamount to denying the existence of eternal substances. Finally, Aristotle may have paid lip service to various divinities, but, Pletho claimed, he was ultimately an atheist. Plato, on the other hand, understood God as “the universal sovereign existing over all things … the originator of originators, the creator of creators.
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Ross King (The Bookseller of Florence: The Story of the Manuscripts That Illuminated the Renaissance)