A hero is somebody who voluntarily walks into the unknown.

I have gone through so many examinations of what a hero is, between the World War II stuff and the astronaut stuff.

Some people are cowards... I think by and large a third of people are villains, a third are cowards, and a third are heroes. Now, a villain and a coward can choose to be a hero, but they've got to make that choice.

I am who I am, and I think I have a good nature, by and large. But if someone takes advantage of that good nature, well then, you know, I'm not that nice a guy.

I think 80 percent of the population are really great, caring people who will help you and tell you the truth. That's just the way it is. And I think 20 percent of the population are crooks and liars. It's just a fact.

Some people go to bed at night thinking, 'That was a good day.' I am one of those who worries and asks, 'How did I screw up today?'