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I'm an optimist about other people. I'm not an optimist about myself.

I think you have an obligation to be an optimist. Because if you're not, nothing will change.

I don't know that I'd call myself an optimist.

I used to be an optimist, but now I know that nothing is going to turn out as I expect.

I may be an optimist.

I am an optimist. It does not seem too much use being anything else.