"Everyone tells you to change your negative thoughts into positive ones. But don't believe the hype. Positive thinking isn't quite the winner it claims to be. Those who drive in the fast and exhilarating lane of positive thinking may easily veer into the ditch of wishful thinking or tumble over the cliff of self-delusion. Much of the recent economic trouble people are finding themselves in, for example, is due to their willingness to think positively, wishfully, delusionally about the rate of appreciation on the value of their homes. For sound mental health, the fundamental question is not whether a thought is negative or positive, but whether it is accurate."