his poem Way of Truth are some of the most contested in the history of philosophy. Yet they do show his significance as the founder of the study of the nature of existence itself, of Being (ontology) as a defined and separate topic for serious debate. Parmenides rejected the Heraclitan idea that everything was in flux. He insisted that existence was unchanging and formed a single whole. It was therefore knowable. Things cannot come into being from nothing and cannot pass away. There is no change or plurality, which means that motion is illusory. Existence has no past and no future. It just is.
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