These thinkers seem to consider that number is the principle both as matter for things and as constituting their attributes and permanent states.
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Aristotle (c. 330 BC) as quoted by Sir Thomas Little Heath, A History of Greek Mathematics, [https://books.google.com/books?id=h4JsAAAAMAAJ Vol. 1], p.67, citing Metaph. A. 5, 986 a 16.