We cannot feel good about an imaginary future when we are busy feeling bad about an actual present.

Your emotions are meant to fluctuate, just like your blood pressure is meant to fluctuate. It’s a system that’s supposed to move back and forth, between happy and unhappy. That’s how the system guides you through the world.

The secret of happiness is variety, but the secret of variety, like the secret of all spices, is knowing when to use it.

Lower your cortisol level. The happiest people have the lowest level of cortisol, a stress hormone that raises blood pressure and weakens the immune system. Cut the stress-more yoga, less road rage-and you'll cut your cortisol production.

We all have direct experience with things that do or don't make us happy, we all have friends, therapists, cabdrivers, and talk-show hosts who tell us about things that will or won't make us happy, and yet, despite all this practice and all this coaching, our search for happiness often culminates in a stinky mess. We expect the next car, the next house, or the next promotion to make us happy even though the last ones didn't and even though others keep telling us that the next ones won't.

The word happiness is used to indicate at least three related things, which we might roughly call emotional happiness, moral happiness, and judgmental happiness.