Hatred is increased by being reciprocated, and can on the other hand be destroyed by love.
Proof .-- He who conceives, that an object of his hatred hates him in return, will thereupon feel a new hatred, while the former hatred (by hypothesis) still remains (III.

xl.).

But if, on the other hand, he conceives that the object of hate loves him, he will to this extent (III.

xxxviii.) regard himself with pleasure, and (III.

xxix.) will endeavour to please the cause of his emotion.