s in return.

Proof.--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.

PROP. XXXIV. The greater the emotion with which we conceive a
loved object to be affected towards us, the greater will be our
complacency.

Proof.--We endeavour (III. xxxiii.), as far as we can, to
bring about, that what we love should love us in return: in
other words, that what we love should be affected with pleasure
accompanied by the idea of ourself as cause. Therefore, in
proportion as the loved object is more pleasurably affected
because of us, our endeavour will be assisted.--that is (III. xi.
and note) the greater will be our pleasure. But when we take
pleasure in the fact, that we pleasurably affect something
similar to ourselves, we regard ourselves with pleasure (III. 30);
therefore the greater the emotion with which we conceive a
loved object to be affected, &c. Q.E.D.

PROP. XXXV. If anyone conceives, that an object of his love
joins itself to another with closer bonds of friendship than he
himself has attained to, he will be affected with hatred towards
the loved object and with envy towards his rival.

Proof.--In proportion as a man thinks, that a loved object is
well affected towards him, will be the strength of his
self--approval (by the last Prop.), that is (III. xxx. note), of
his pleasure; he will, therefore (III. xxviii.), endeavour, as
far as he can, to imagine the loved object as most closely bound
to him: this endeavour or desire will be increased, if he thinks
that someone else has a similar desire (III. xxxi.). But this
endeavour or desire is assumed to be checked by the image of the
loved object in conjunction with the image of him whom the loved
object has joined to itself; therefore (III. xi. note) he will
for that reason be affected with pain, accompanied by the idea of
the loved object as a cause in conjunction with the image of his
rival; that is, he will be (III. xiii.) affected with hatred
towards the loved object and also towards his rival (III. xv.
Coroll.), which latter he will envy as enjo