viii] ), wherefore their idea also necessarily
(by I:[A.iv] ) involves the nature of both bodies; therefore, the idea of
every mode, in which the human body is affected by external bodies,
involves the nature of the human body and of the external body. Q.E.D.
Corollary I.- (16:2) Hence it follows, first, that the human mind perceives
the nature of a variety of bodies, together with the nature of its own.
Corollary II.- (16:3) It follows, secondly, that the ideas, which we have
of external bodies, indicate rather the constitution of our own body tha
the nature of external bodies. (4) I have amply illustrated this in the
I:[Appendix] to Part I.
Prop.[XVII] If the human body is affected in a manner which
involves the nature of any external body, the
mind will regard the said external body as actually
existing, or as present to itself, until the
body be affected in such a way, as to exclude the
existence or the presence of the said external body.
Proof.- (17:1) This proposition is self-evident, for so long as the human
body continues to be thus affected, so long will the human mind ([xii] )
regard this modification of the body - that is (by [XVI] ), it will have
the idea of the mode as actually existing, and this idea involves the
nature of the external body. (2) In other words, it will have the idea
which does not exclude, but postulates the existence or presence of the
nature of the external body; therefore the mind (by [xvi] Coroll.
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