The outlook embedded in these three words does more than connect us in some ineffable fashion. According to Dr. Laura Carstensen, an influential psychology professor who runs the Stanford Life-span Development Laboratory and Stanford Center on Longevity, it also has the power to help us to live in the present, forgive more easily, love more deeply, and experience more gratitude and contentment, and less stress and anger.

Bittersweet by Susan Cain