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I try not to be too optimistic or pessimistic. If you're a pessimist then that's depressing all the time; if you're an optimist and things don't work out then that's depressing, too.

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

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

I actually think that I'm a rather optimistic and happy person; it's just that I'm not a very positive person, if you see the difference.

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.

To a profound pessimist about life, being in danger is not depressing.

Optimism is the key.

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