But here we are regarding hatred only.
PROP.XXIV.

If we conceive that anyone pleasurably affects an object of our hate, we shall feel hatred towards him also.

If we conceive that he painfully affects that said object, we shall feel love towards him.
Proof .-- This proposition is proved in the same way as III.
xxii., which see.
Note .-- These and similar emotions of hatred are attributable to envy, which, accordingly, is nothing else but hatred, in so far as it is regarded as disposing a man to rejoice in another's hurt, and to grieve at another's advantage.
PROP.XXV.

We endeavour to affirm, concerning ourselves, and concerning what we love, everything that we can conceive to affect pleasurably ourselves, or the loved object.

Contrariwise, we endeavour to negative everything, which we conceive to affect painfully ourselves or the loved object.
Proof .-- That, which we conceive to affect an object of our love pleasurably or painfully, affects us also pleasurably or painfully (III.