Selection from – Ethics – Part III. On the Nature and Origin of the Emotions (Page 8)

Spinoza's Words: (when a hated object is destroyed pleasure results)

Proposition. XXIII. He who conceives, that an object of his hatred is painfully affected, will feel pleasure. Contrariwise, if he thinks that the said object is pleasurably affected, he will feel pain. Each of these emotions will be greater or less, according as its contrary is greater or less in the object of hatred.