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Chapter XI

Of Discerning, and other Operations of the Mind.
No Knowledge without it.       §1. Another Faculty, we may take notice of in our Minds, is
that of Discerning and distinguishing between the several Ideas it
has. It is not enough to have a confused Perception of something in
general: Unless the Mind had a distinct Perception of different
Objects, and their Qualities, it would be capable of very little
Knowledge; though the Bodies that affect us, were as busie about
us, as they are now, and the Mind were continually employ’d in
thinking. On this faculty of Distinguishing one thing from another,
depends the evidence and certainty of several, even very general
Propositions, which have passed for innate Truths; because Men
over-looking the true cause, why those Propositions find universal
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assent, impute it wholly to native uniform Impressions; whereas it
in truth depends upon this clear discerning Faculty of the Mind, whereby
it perceives two Ideas to be the same, or different. But of this more
hereafter.
Locke Hum II, 11, §1, pp. 155-156