Q.E.D.
Prop.[XXV] The idea of each modification of the human body
does not involve an adequate knowledge of the
external body.
Proof.- (25:1) We have shown that the idea of a modification of the human
body involves the nature of an external body, in so far as that external
body conditions the human body in a given manner. (2) But, in so far as
the external body is an individual, which has no reference to the human
body, the knowledge or idea thereof is in God ([ix] ), in so far as God
is regarded as affected by the idea of a further thing, which ([vii] ) is
naturally prior to the said external body. (25:3) Wherefore an adequate
knowledge of the external body is not in God, in so far as he has the
idea of the modification of the human body; in other words, the idea of
the modification of the human body does not involve an adequate knowledge
of the external body. Q.E.D.
Prop.[XXVI] The human mind does not perceive any external
body as actually existing, except through the
ideas of the modifications of its own body.
Proof.- (26:1) If the human body is in no way affected by a given external
body, then ([vii] ) neither is the idea of the human body, in other words,
the human mind, affected in any way by the idea of the existence of the
said external body, nor does it any manner perceive its existence.
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