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Chapter VIII

Some farther Considerations concerning our simple Ideas.
Positive Ideas from Privative Causes.       §1. Concerning the simple Ideas of Sensation ’tis to be con-
sidered, That whatsoever is so constituted in Nature, as to be able,
by affecting our Senses, to cause any perception in the Mind,
doth thereby produce in the Understanding a simple Idea; which,
whatever be the external cause of it, when it comes to be taken
notice of, by our discerning Faculty, it is by the Mind looked on
and considered there, to be a real positive Idea in the Understanding,
as much as any other whatsoever; though, perhaps, the cause of it
be but a privation in the subject.
Locke Hum II, 8, §1, p. 132