" When I told him that I just wanted you to be happy, he gave me his opinion of happiness. He claimed it was a superficial, fleeting sensation that most people don’t even recognize when it happens to them. They only pay attention when they find themselves unhappy. And then they tend to feel resentful and angry.” “He has a point, I suppose.” “He went on to say that what really mattered was the ability to experience joy. He seems to feel that is the more powerful emotion because it endures, regardless of circumstances. Once you’ve known joy, you are never quite the same. It changes a person. "

― Jayne Ann Krentz , Promise Not to Tell (Culter, Sutter & Salinas #2)