P24: The human Mind does not involve adequate knowledge of the parts composing the human Body.

Dem.: The parts composing the human Body pertain to the essence of the Body itself only insofar as they communicate their motions to one another in a certain fixed manner (see the Definition after L3C), and not insofar as they can be considered as Individuals, without relation to the human Body. For (by Post. 1) the parts of the human Body are highly composite Individuals, whose parts (by L4) can be separated from the human Body and communicate their motions (see A1″ after L3) to other bodies in another manner, while the human Body completely preserves its nature and form. And so the idea, or knowledge, of each part will be in God/Nature (by P3), insofar as he is considered to be affected by another idea of a singular thing (by P9), a singular thing which is prior, in the order of nature, to the part itself (by P7). The same must also be said of each part of the Individual composing the human Body. And so, the knowledge of each part composing the human Body is in God/Nature insofar as he is affected with a great many ideas of things, and not insofar as he has only the idea of the human Body, i.e. (by P13), the idea that constitutes the nature of the human Mind. And so, by (P11 C) the human Mind does not involve adequate knowledge of the parts composing the human Body, q.e.d.