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Optimism is the key.

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

Hope is definitely not the same thing as optimism. It is not the conviction that something will turn out well, but the certainty that something makes sense, regardless of how it turns out.

Optimism doesn't wait on facts. It deals with prospects. Pessimism is a waste of time.

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 is the faith that leads to achievement. Nothing can be done without hope and confidence.

Optimism is the foundation of courage.

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

The basis of optimism is sheer terror.

History can bring luck: this is what we can call optimism.