— 147 —
      §10. Nor need we wonder, that this is done with so little notice,
if we consider, how very quick the actions of the Mind are performed:
For as it self is thought to take up no space, to have no extension; so
its actions seem to require no time, but many of them seem to be
crouded into an Instant. I speak this in comparison to the Actions
of the Body. Any one may easily observe this in his own Thoughts,
who will take the pains to reflect on them. How, as it were in an
instant, do our Minds, with one glance, see all the parts of a
demonstration, which may very well be called a long one, if we
consider the time it will require to put it into words, and step by
step shew it another? Secondly, we shall not be so much surprized,
that this is done in us with so little notice, if we consider, how the
facility which we get of doing things, by a custom of doing, makes
them often pass in us without our notice. Habits, especially such as
are begun very early, come, at last, to produce actions in us, which
often escape our observation. How frequently do we, in a day, cover our
Eyes with our Eye-lids, without perceiving that we are at all in the
dark? Men, that by custom have got the use of a By-word, do almost
in every sentence, pronounce sounds, which, though taken notice of
by others, they themselves neither hear, nor observe. And therefore
’tis not so strange, that our Mind should often change the Idea of its
Sensation, into that of its Judgment, and make one serve only to
excite the other, without our taking notice of it.
Locke Hum II, 9, §10, p. 147