There are physical characteristics which are inherited. These include things like good looks, high intelligence, physical coordination. These attributes contribute to success in life, and success in life is a determinant of optimism.

I've been bothered about time generally and our tripartite division of time into past, present, and future. I think I know what the past is, and I think I know what future is, but I'm really not comfortable with the notion of present.

I'm all for past influences; the question is whether they are deterministic. Freud and the behaviorists argue that what we are at any given moment is billiard balls whose past determines our future course. That doesn't take into account that we are forever generating internal representations of positive futures and choosing among them.

The goal of a life free of dysphoria is a snare and a delusion. A better goal is of good commerce with the world. Authentic happiness, astonishingly, can occur even in the presence of authentic sadness.

One thing that was amazing about World War II was that everybody signed up for the duration plus six months. Fliers got to leave combat after 25 missions, or 35 missions, but other than that, you were in it. You were part of the great effort, until, oh boy, six months after it was over.

I think if people really listened to what our families who serve go through, we could have a realistic discussion of what it means to send young people to war.

All you have to do is hold your first soldier who is dying in your arms, and have that terribly futile feeling that I can't do anything about it... Then you understand the horror of war.

Since World War II, inflation - the apparently inexorable rise in the prices of goods and services - has been the bane of central bankers.