E3P36D
Demonstration — Part III
Latin
Quicquid homo simul cum re quæ ipsum delectavit, vidit, id omne (per propositionem 15 hujus) erit per accidens lætitiæ causa adeoque (per propositionem 28 hujus) omni eo simul cum re quæ ipsum delectavit, potiri cupiet sive re cum omnibus iisdem circumstantiis potiri cupiet ac cum primo eadem delectatus est. Q.E.D.
English (Elwes 1883)
Everything, which a man has seen in conjunction with the object of his love, will be to him accidentally a cause of pleasure (III. xv.); he will, therefore, desire to possess it, in conjunction with that wherein he has taken delight; in other words, he will desire to possess the object of his love under the same circumstances as when he first took delight therein. Q.E.D.
Modern English
Everything a person saw together with a thing that delighted him will be an incidental cause of joy (E3P15), and so he will desire to possess all of it together with the thing that delighted him (E3P28), that is, he will desire to possess the thing under the same circumstances as when he first took delight in it. Q.E.D.