To understand well-being, then, we also need to understand personal strengths and the virtues, and this is the topic of the second part of this book. When well-being comes from engaging our strengths and virtues, our lives are imbued with authenticity. Feelings are states, momentary occurrences that need not be recurring features of personality. Traits, in contrast to states, are either negative or positive characteristics that recur across time and different situations, and strengths and virtues are the positive characteristics that bring about good feeling and gratification. Traits are abiding dispositions whose exercise makes momentary feelings more likely. The negative trait of paranoia makes the momentary state of jealousy more likely, just as the positive trait of being humorous makes the state of laughing more likely.