Full Idea
The reason for saying of each number that it is many is just that it is ones and that each number is measured by the one.
Gist of Idea
Each many is just ones, and is measured by the one
Source
Aristotle (Metaphysics [c.324 BCE], 1056b16)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.304