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Chapter II

Of simple Ideas.
Uncompounded Appearances.       §1. The better to understand the Nature, Manner, and Extent of
our Knowledge, one thing is carefully to be observed, concerning
the Ideas we have; and that is, That some of them are simple, and some
      Though the Qualities that affect our Senses, are, in the things
themselves, so united and blended, that there is no separation, no
distance between them; yet ’tis plain, the Ideas they produce in the
Mind, enter by the Senses simple and unmixed. For though the
Sight and Touch often take in from the same Object, at the same
time, different Ideas; as a Man sees at once Motion and Colour; the
Hand feels Softness and Warmth in the same piece of Wax: Yet the
simple Ideas thus united in the same Subject, are as perfectly dis-
tinct, as those that come in by different Senses. The coldness and
hardness, which a Man feels in a piece of Ice, being as distinct Ideas
in the Mind, as the Smell and Whiteness of a Lily; or as the taste of
Sugar, and smell of a Rose: And there is nothing can be plainer to a
Man, than the clear and distinct Perception he has of those simple
Ideas; which being each in it self uncompounded, contains in it
nothing but one uniform Appearance, or Conception in the mind, and
is not distinguishable into different Ideas.
Locke Hum II, 2, §1, p. 119