…twenty-five years of study has convinced me that if we habitually believe, as does the pessimist, that misfortune is our fault, is enduring, and will undermine everything we do, more of it will befall us than if we believe otherwise. …. Pessimistic prophecies are self-fulfilling.
We are in the middle of an epidemic of depression ….. Severe depression is ten times more prevalent today than it was fifty years ago. It assaults women twice as often as men, and it now strikes a full decade earlier in life on average than it did a generation ago.