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If I think when I know it not, no body else can know it.       §17. Those who so confidently tell us, That the Soul always
actually thinks, I would they would also tell us, what those Ideas
are, that are in the Soul of a Child, before, or just at the union with
the Body, before it hath received any by Sensation. The Dreams of
sleeping Men, are, as I take it, all made up of the waking Mans Ideas,
though, for the most part, oddly put together. ’Tis strange, if the
Soul has Ideas of its own, that it derived not from Sensation or
Reflection, (as it must have, if it thought before it received any
impressions from the Body) that it should never, in its private
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thinking, (so private, that the Man himself perceives it not) retain
any of them, the very moment it wakes out of them, and then make
the Man glad with new discoveries. Who can find it reasonable,
that the Soul should, in its retirement, during sleep, have so many
hours thoughts, and yet never light on any of those Ideas it borrowed
not from Sensation or Reflection, or at least preserve the memory of
none, but such, which being occasioned from the Body, must needs
be less natural to a Spirit? ’Tis strange, the Soul should never once
in a Man’s whole life, recal over any of its pure, native Thoughts,
and those Ideas it had before it borrowed any thing from the Body;
never bring into the waking Man’s view, any other Ideas, but what
have a tangue of the Cask, and manifestly derive their Original from
that union. If it always thinks, and so had Ideas before it was united,
or before it received any from the Body, ’tis not to be supposed, but
that during sleep, it recollects its native Ideas, and during that
retirement from communicating with the Body, whilst it thinks by
it self, the Ideas, it is busied about, should be, sometimes at least,
those more natural and congenial ones which it had in it self, un-
derived from the Body or its own Operations about them: which
since the waking Man never remembers, we must from this Hy-
pothesis conclude, either that the Soul remembers something that
the Man does not; or else that Memory belongs only to such Ideas,
as are derived from the Body, or the Minds Operations about them.
Locke Hum II, 1, §17, pp. 113-114