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.

I think people have this love-hate relationship with tennis. I also feel like that.

Some of my Democratic friends don't like it when I say that, but Ronald Reagan was once a Democrat and still a leader. He brought strong people around him, and he had a vision for where he wanted to take the country.

All those who offer an opinion on any doubtful point should first clear their minds of every sentiment of dislike, friendship, anger or pity.

I've always just tried to treat people with respect, build relationships with players and coaches... build a trust.