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Full Idea
There are two kinds of change, I think: alteration and motion.
Gist of Idea
There seem to be two sorts of change: alteration and motion
Source
Plato (Theaetetus [c.368 BCE], 181d)
Book Ref
Plato: 'Theaetetus', ed/tr. Waterfield,Robin [Penguin 1987], p.81