This is a philosophy book. What is called happiness is an abstract idea, composed of various ideas of pleasure; for he who has but a moment of pleasure is not a happy man, in like manner that a moment of grief constitutes not a miserable one. Pleasure is more transient than happiness, and happiness than felicity. When a person says--I am happy at this moment, he abuses the word, and only means I am pleased. When pleasure is continuous, he may then call himself happy. When this happiness lasts a little longer, it is a state of felicity. We are sometimes very far from being happy in prosperity, just as a surfeited invalid eats nothing of a great feast prepared for him.