Difficulties should act as a tonic. They should spur us to greater exertion.

What you have outside you counts less than what you have inside you.

There is more credit and satisfaction in being a first-rate truck driver than a tenth-rate executive.

Real riches are the riches possessed inside.

It's our hearts and brains that we should exercise more often. You can put on all the makeup you want, but it won't make your soul pretty.

We may have to learn to live with cancer rather than die of it. It means a big change in our mindset and how we do research. We haven't quite reached there yet.

I start asking a lot of questions about my own life, and it's not necessarily fun, but it's a good exercise.

Economists specialize in pointing out unpleasant trade-offs - a skill that is on full display in the health care debate. We want patients to receive the best care available. We also want consumers to pay less. And we don't want to bankrupt the government or private insurers. Something must give.