For we assume that Peter has the idea of the loved object as already in his possession, while Paul has the idea of the loved object as lost.

Hence the one man will be affected with pleasure, the other will be affected with pain, and thus they will be at variance one with another.

We can easily show in like manner, that all other causes of hatred depend solely on differences, and not on the agreement between men's natures.
PROP.XXXV.

In so far only as men live in obedience to reason, do they always necessarily agree in nature.
Proof .-- In so far as men are assailed by emotions that are passions, they can be different in nature (IV.

xxxiii.), and at variance one with another.