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      §25. I allow, it is usual for most People to wonder, how any one
should find a difficulty in what they think, they every day observe.
Do we not see, will they be ready to say, the parts of Bodies stick
firmly together? Is there any thing more common? And what doubt
can there be made of it? And the like, I say, concerning Thinking,
and voluntary Motion: Do we not every moment experiment it in our
selves; and therefore can it be doubted? The matter of Fact is clear,
I confess; but when we would a little nearer look into it, and
consider how it is done, there, I think, we are at a loss, both in the
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one, and the other; and can as little understand how the parts of
Body cohere, as how we our selves perceive, or move. I would have
any one intelligibly explain to me, how the parts of Gold, or Brass,
(that but now in fusion were as loose from one another, as the
Particles of Water, or the Sands of an Hour-glass,) come in a few
moments to be so united, and adhere so strongly one to another,
that the utmost force of Mens arms cannot separate them: A con-
sidering Man will, I suppose, be here at a loss, to satisfie his own, or
another Man’s Understanding.
Locke Hum II, 23, §25, pp. 309-310