E5P21D
Demonstration — Part V
Latin
Mens actualem sui corporis existentiam non exprimit neque etiam corporis affectiones ut actuales concipit nisi durante corpore (per corollarium propositionis 8 partis II) et consequenter (per propositionem 26 partis II) nullum corpus ut actu existens concipit nisi durante suo corpore ac proinde nihil imaginari (vide imaginationis definitionem in scholio propositionis 17 partis II) neque rerum præteritarum recordari potest nisi durante corpore (vide definitionem memoriæ in scholio propositionis 18 partis II). Q.E.D.
English (Elwes 1883)
The mind does not express the actual existence of its body, nor does it imagine the modifications of the body as actual, except while the body endures (II. viii. Coroll.); and, consequently (II. xxvi.), it does not imagine any body as actually existing, except while its own body endures. Thus it cannot imagine anything (for definition of Imagination, see II. xvii. note), or remember things past, except while the body endures (see definition of Memory, II. xviii. note). Q.E.D.
Modern English
The mind does not express the actual existence of its body, nor does it conceive the body's affections as actual, except while the body endures (E2P8C). Consequently (E2P26), it conceives no body as actually existing except while its own body endures. Therefore it can neither imagine anything (E2P17S) nor recall past things (E2P18S) except while the body endures. Q.E.D.