The
most lively thought is still inferior to the dullest sensation.
We may observe a like distinction to run through all the other
perceptions of the mind. A man in a fit of anger, is actuated in a
very different manner from one who only thinks of that emotion. If you
tell me, that any person is in love, I easily understand your meaning,
and form a just conception of his situation; but never can mistake
that conception for the real disorders and agitations of the
passion. When we reflect on our past sentiments and affections, our
thought is a faithful mirror, and copies its objects truly; but the
colours which it employs are faint and dull, in comparison of those in
which our original perceptions were clothed. It requires no nice
discernment or metaphysical head to mark the distinction between them.
12. Here therefore we may divide all the perceptions of the mind
into two classes or species, which are distinguished by their
different degrees of force and vivacity. The less forcible and
lively are commonly denominated Thoughts or Ideas. The other species
want a name in our language, and in most others; I suppose, because it
was not requisite for any, but philosophical purposes, to rank them
under a general term or appellation. Let us, therefore, use a little
freedom, and call them Impressions; employing that word in a sense
somewhat different from the usual.
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