E5P34D
Demonstration — Part V
Latin
Imaginatio est idea qua mens rem aliquam ut præsentem contemplatur (vide ejus definitionem in scholio propositionis 17 partis II) quæ tamen magis corporis humani præsentem constitutionem quam rei externæ naturam indicat (per II corollarium propositionis 16 partis II). Est igitur affectus (per generalem affectuum definitionem) imaginatio quatenus corporis præsentem constitutionem indicat atque adeo (per propositionem 21 hujus) mens non nisi durante corpore obnoxia est affectibus qui ad passiones referuntur. Q.E.D.
English (Elwes 1883)
Imagination is the idea wherewith the mind contemplates a thing as present (II. xvii. note); yet this idea indicates rather the present disposition of the human body than the nature of the external thing (II. xvi. Coroll. ii.). Therefore emotion (see general Def. of Emotions) is imagination, in so far as it indicates the present disposition of the body; therefore (V. xxi.) the mind is, only while the body endures, subject to emotions which are attributable to passions. Q.E.D.
Modern English
Imagination is the idea by which the mind contemplates a thing as present (E2P17S), but this idea indicates the present constitution of the human body rather than the nature of the external thing (E2P16C2). An affect (by the general definition of the affects) is imagination insofar as it indicates the present constitution of the body. Therefore (E5P21) the mind is subject to those affects that are referred to as passions only while the body endures. Q.E.D.