E3P33D
Demonstration — Part III
Latin
Rem quam amamus præ reliquis quantum possumus imaginari conamur (per propositionem 12 hujus). Si igitur res nobis sit similis, ipsam præ reliquis lætitia afficere conabimur (per propositionem 29 hujus) sive conabimur quantum possumus efficere ut res amata lætitia afficiatur concomitante idea nostri hoc est (per scholium propositionis 13 hujus) ut nos contra amet. Q.E.D.
English (Elwes 1883)
That which we love we endeavour, as far as we can, to conceive in preference to anything else (III. xii.). If the thing be similar to ourselves, we shall endeavour to affect it pleasurably in preference to anything else (III. xxix.). In other words, we shall endeavour, as far as we can, to bring it about, that the thing should be affected with pleasure accompanied by the idea of ourselves, that is (III. xiii. note), that it should love us in return. Q.E.D.
Modern English
We strive, as far as we can, to imagine the thing we love above all else (E3P12). If that thing is similar to us, we will strive to affect it with joy above all else (E3P29), that is, we will strive, as far as we can, to bring about that the beloved thing is affected with joy accompanied by the idea of us (E3P13S), which is just that it love us in return. Q.E.D.