All that is required to become an optimist is to have the goal and to practice it. The more you rehearse optimistic thoughts, the more 'natural' and 'ingrained' they will become. With time they will be part of you, and you will have made yourself into an altogether different person.

Thus the key to happiness lies not in changing our genetic makeup (which is impossible) and not in changing our circumstances (i.e., seeking wealth or attractiveness or better colleagues, which is usually impractical), but in our daily intentional activities.

It turns out that the process of working toward a goal, participating in a valued and challenging activity, is as important to well-being as its attainment.

Women’s magazines will often ask me things like, 'All right, I need six five-minute happiness strategies.' And I say, well, there aren’t any five-minute happiness strategies. This is something you have to do kind of every day for the rest of your life. Just like if you want to raise moral children or if you want to advance in your career. It’s a goal you pursue your whole life.

It is equally important to investigate wellness as it is to study misery.

If we observe genuinely happy people, we shall find that they do not just sit around being contented. They make things happen. They pursue new understandings, seek new achievements, and control their thoughts and feelings. In sum, our intentional, effortful activities have a powerful effect on how happy we are, over and above the effects of our set points and the circumstances in which we find themselves. If an unhappy person wants to experience interest, enthusiasm, contentment, peace, and joy, he or she can make it happen by learning the habits of a happy person.

The combination of rumination and negative mood is toxic. Research shows that people who ruminate while sad or distraught are likely to feel besieged, powerless, self-critical, pessimistic, and generally negatively biased.