note) increases or aids a man's power of activity, it may easily be shown in like manner, that a man affected by pleasure has no desire further than to preserve it, and his desire will be in proportion to the magnitude of the pleasure.
Lastly, since hatred and love are themselves emotions of pain and pleasure, it follows in like manner that the endeavour, appetite, or desire, which arises through hatred or love, will be greater in proportion to the hatred or love.

Q.E.D.
PROP.XXXVIII.

If a man has begun to hate an object of his love, so that love is thoroughly destroyed, he will, causes being equal, regard it with more hatred than if he had never loved it, and his hatred will be in proportion to the strength of his former love.
Proof .-- If a man begins to hate that which he had loved, more of his appetites are put under restraint than if he had never loved it.

For love is a pleasure (III.xiii.

note) which a man endeavours as far as he can to render permanent (III.