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Ideas for 'fragments/reports', 'Dynamic Logics' and 'Two letters on mind'

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26. Natural Theory / A. Speculations on Nature / 7. Later Matter Theories / c. Matter as extension

16684	Impenetrability only belongs to the essence of extension [Descartes]
	Full Idea: It is demonstrated that impenetrability belongs to the essence of extension and not to the essence of any other thing.
	From: René Descartes (Two letters on mind [1649], More, Apr 1649), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 15.5
	A reaction: I'm not sure that I understand how pure extension can be impenetrable.