— 161 —
Method.       §14. These, I think, are the first Faculties and Operations of the
Mind, which it makes use of in Understanding; and though they are
exercised about all its Ideas in general; yet the Instances, I have
hitherto given, have been chiefly in simple Ideas; and I have sub-
joined the explication of these Faculties of the Mind, to that of
simple Ideas, before I come to what I have to say, concerning complex
ones, for these following Reasons:
      First, Because several of these Faculties being exercised at first
principally about simple Ideas, we might, by following Nature in its
ordinary, method, trace and discover them in their rise, progress,
and gradual improvements.
      Secondly, Because observing the Faculties of the Mind, how they
operate about simple Ideas, which are usually in most Men’s Minds
— 162 —
much more clear, precise, and distinct, than complex ones, we may
the better examine and learn how the Mind abstracts, denominates,
compares, and exercises its other Operations, about those which are
complex, wherein we are much more liable to mistake.
      Thirdly, Because these very Operations of the Mind about Ideas,
receiv’d from Sensation, are themselves, when reflected on, another
set of Ideas, derived from that other source of our Knowledge, which
I call Reflection; and therefore fit to be considered in this place,
after the simple Ideas of Sensation. Of Compounding, Comparing,
Abstracting, etc. I have but just spoken, having occasion to treat of
them more at large in other places.
Locke Hum II, 11, §14, pp. 161-162