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

Sometimes pessimism or optimism gets popular, and it's contagious.

Whereas in the past optimism had been regarded as rather shallow - because 'oh well, it's just your temperament, you happen to be just a cheerful sort of person' - what I wanted to do was to establish that in fact it is the pessimists who are allowing all kinds of errors to creep into their work.

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

My pessimism extends to the point of even suspecting the sincerity of other pessimists.

My pessimism goes to the point of suspecting the sincerity of the pessimists.

I have friends who are very pessimistic. They say you can't possibly be an optimist nowadays. But I think, taking the longer view, you can still be as optimistic as you want.

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

Optimism means better than reality; pessimism means worse than reality. I'm a realist.