E4P36D
Demonstration — Part IV
Latin
Ex virtute agere est ex ductu rationis agere (per propositionem 24 hujus) et quicquid ex ratione conamur agere, est intelligere (per propositionem 26 hujus) atque adeo (per propositionem 28 hujus) summum bonum eorum qui virtutem sectantur, est Deum cognoscere hoc est (per propositionem 47 partis II et ejusdem scholium) bonum quod omnibus hominibus commune est et ab omnibus hominibus quatenus ejusdem sunt naturæ, possideri æque potest. Q.E.D.
English (Elwes 1883)
To act virtuously is to act in obedience with reason (IV. xxiv.), and whatsoever we endeavour to do in obedience to reason is to understand (IV. xxvi.); therefore (IV. xxviii.) the highest good for those who follow after virtue is to know God; that is (II. xlvii. and note) a good which is common to all and can be possessed by all men equally, in so far as they are of the same nature. Q.E.D.
Modern English
To act from virtue is to act under the guidance of reason (E4P24), and whatever we strive to do through reason is to understand (E4P26). Therefore (E4P28) the highest good of those who pursue virtue is to know God, that is, (E2P47), a good common to all human beings, which all can equally possess insofar as they are of the same nature. Q.E.D.