Both positive and negative ways of thinking are important in the right situation, but all too often schools emphasize critical thinking and following orders rather than creative thinking and learning new stuff. The result is that children rank the appeal of going to school just slightly above going to the dentist. In the modern world, I believe we have finally arrived at an era in which more creative thinking, less rote following of orders — and yes, even more enjoyment — will succeed better.

The takeaway lesson from positive psychology is that positive mental health is not just the absence of mental illness.

So it is possible that the twin epidemics among young people in the United States today, depression and violence, both come from this misbegotten concern: valuing how our young people feel about themselves more highly than how we value how well they are doing in the world.