E4P5D
Demonstration — Part IV
Latin
Passionis essentia non potest per solam nostram essentiam explicari (per definitiones 1 et 2 partis III) hoc est (per propositionem 7 partis III) passionis potentia definiri nequit potentia qua in nostro esse perseverare conamur sed (ut propositione 16 partis II ostensum est) definiri necessario debet potentia causæ externæ cum nostra comparata. Q.E.D.
English (Elwes 1883)
The essence of a passion cannot be explained through our essence alone (III. Deff. i. and ii.), that is (III. vii.), the power of a passion cannot be defined by the power, whereby we ourselves endeavour to persist in existing, but (as is shown in II. xvi.) must necessarily be defined by the power of an external cause compared with our own. Q.E.D.