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.

What’s so curious about human beings is that we can look deeply into the future, foresee disaster, and still do nothing in the present to stop it. The majority of people on this planet, they’re overwhelmed with concerns about their immediate well being.

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 human brain is the only object in the known universe that can predict its own future and tell its on fortune. The fact that we can make disastrous decisions even as we foresee their consequences is the great, unsolved mystery of human behavior. When you hold your fate in your hands, why would you ever make a fist?

The brain and the eye may have a contractual relationship in which the brain has agreed to believe what the eye sees, but in return the eye has agreed to look for what the brain wants.

We don't believe other people's experiences can tell us all that much about our own. I think this is an illusion of uniqueness.

The mistakes we make when we try to imagine our personal futures are also lawful, regular, and systematic. They, too, have a pattern that tells us about the powers and limits of foresight in much the same way that optical illusions tell us about the powers and limits of eyesight.