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Both hope and pessimism are deeply contagious. And no one is more infectious than a leader.

Pessimism, when you get used to it, is just as agreeable as optimism.

I understand the concept of optimism. But I think with me what you get is a lack of cynicism.

There's probably a little greater case for pessimism than optimism. But I do not rule out optimism.

Pessimism leads to weakness, optimism to power.

There are really two kinds of optimism. There's the complacent, Pollyanna optimism that says, 'Don't worry - everything will be just fine,' and that allows one to just lay back and do nothing about the problems around you. Then there's what we call dynamic optimism. That's an optimism based on action.

Optimism isn't funny unless you are laughing at the person, whereas extreme pessimism is extremely funny. It's exaggeration.

It is the hopeful, buoyant, cheerful attitude of mind that wins. Optimism is a success builder; pessimism an achievement killer.

Optimism is a kind of heart stimulant - the digitalis of failure.

Optimism is the madness of insisting that all is well when we are miserable.