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Full Idea
It may well be necessary that certain unobserved substances exist as it is, even if we cannot know which they are.
Gist of Idea
We may have to postulate unobservable and unknowable substances
Source
Aristotle (Metaphysics [c.324 BCE], 1041a02)
Book Ref
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.226