E2P29D
Demonstration — Part II
Latin
Idea enim affectionis corporis humani (per propositionem 27 hujus) adæquatam ipsius corporis cognitionem non involvit sive ejus naturam adæquate non exprimit hoc est (per propositionem 13 hujus) cum natura mentis non convenit adæquate adeoque (per axioma 6 partis I) hujus ideæ idea adæquate humanæ mentis naturam non exprimit sive adæquatam ejus cognitionem non involvit. Q.E.D.
English (Elwes 1883)
The idea of a modification of the human body (II. xxvii.) does not involve an adequate knowledge of the said body, in other words, does not adequately express its nature; that is (II. xiii.) it does not agree with the nature of the mind adequately; therefore (I. Ax. vi) the idea of this idea does not adequately express the nature of the human mind, or does not involve an adequate knowledge thereof.
Modern English
The idea of an affection of the human body (E2P27) does not involve an adequate knowledge of the body itself, that is, it does not adequately express the body's nature. In other words (E2P13), it does not agree adequately with the nature of the mind. Therefore (E1A6), the idea of this idea does not adequately express the nature of the human mind, and does not involve an adequate knowledge of it. Q.E.D.