Q.E.D.
Note.- (21:2) This proposition is comprehended much more clearly from what
we said in the note to [vii] . (3) We there showed that the idea of body
and body, that is, mind and body ([xiii] ), are one and the same individual
conceived now under the attribute of thought, now under the attribute of
extension; wherefore the idea of the mind and the mind itself are one and
the same thing, which is conceived under one and the same attribute,
namely, thought. (4) The idea of the mind, I repeat, and the mind itself
are in God by the same necessity and follow from him from the same power
of thinking. (21:5) Strictly speaking, the idea of the mind, that is, the
idea of an idea, is nothing but the distinctive quality (forma) of the
idea in so far as it is conceived as a mode of thought without reference
to the object; if a man knows anything, he, by that very fact, knows that
he knows it, and at the same time knows that he knows that he knows it,
and so on to infinity. (21:6) But I will treat of this hereafter.
Prop.[XXII] The human mind perceives not only the
modifications of the body, but also the
ideas of such modifications.
Proof.- (22:1) The ideas of the ideas of modifications follow in God in
the same manner, and are referred to God in the same manner, as the ideas
of the said modifications. (2) This is proved in the same way as [xx] .
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