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The Eleatic One, a concept in Eleatic philosophy, asserts that Being is singular, continuous, and indivisible. This idea, primarily attributed to Parmenides, posits that only Being exists, and anything else is nothing. Aristotle elaborated that since only Being exists, there can be no second, separate thing. Furthermore, without "Not-Being," nothing can divide Being from Being, making it whole and continuous.1

This concept influenced later thinkers, including Plato, who explored the idea of abstract forms as singular entities. Neoplatonism, particularly through Plotinus, developed this into a divine One from which all reality emanates in a hierarchical order. This "Great Chain of Being" suggests a universe filled with diverse existences, arranged from the simplest to God, emphasizing unity and interconnectedness. Monistic idealism, a related philosophical system, emphasizes the primacy of the One over the many.234

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