Where does such relentless optimism in the face of unyielding misery come from?

As the economy recovers, I think you're going to see this optimism that has an innate quality of America come back.

His optimism, he said, comes from the agencies' corporate travel initiatives and their international expansion efforts.

There is no telling when such public optimism will come to an end.

To look at the sunny side of everything and make your optimism come true.

When the extreme pessimism or optimism comes into question, the market moves sharply in the opposite direction.

Her natural optimism came back when she could throttle up.

There was only one occasion when his optimism came into doubt.

Go back to last summer, when Americans' optimism about the economy came close to a 50-year high, according to the University of Michigan.

But his warmth, optimism and sense of larger purpose come through equally well.