E3P9D
Demonstration — Part III
Latin
Mentis essentia ex ideis adæquatis et inadæquatis constituitur (ut in propositione 3 hujus ostendimus) adeoque (per propositionem 7 hujus) tam quatenus has quam quatenus illas habet, in suo esse perseverare conatur idque (per propositionem 8 hujus) indefinita quadam duratione. Cum autem mens (per propositionem 23 partis II) per ideas affectionum corporis necessario sui sit conscia, est ergo (per propositionem 7 hujus) mens sui conatus conscia. Q.E.D.
English (Elwes 1883)
The essence of the mind is constituted by adequate and inadequate ideas (III. iii.), therefore (III. vii.), both in so far as it possesses the former, and in so far as it possesses the latter, it endeavours to persist in its own being, and that for an indefinite time (III. viii.). Now as the mind (II. xxiii.) is necessarily conscious of itself through the ideas of the modifications of the body, the mind is therefore (III. vii.) conscious of its own endeavour.
Modern English
The essence of the mind is constituted by adequate and inadequate ideas (E3P3). Therefore (E3P7), both insofar as the mind has the one and insofar as it has the other, it strives to persist in its being, and that for an indefinite duration (E3P8). Since the mind (E2P23) is necessarily conscious of itself through the ideas of the affections of the body, it is therefore (E3P7) conscious of its *conatus*. Q.E.D.