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

I'm an optimist by nature.

You have to be an optimist, right? You have to be critical, then you have to be an optimist. Or else you're really stupid.

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

I would say I'm an optimist by nature.

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

I'm an optimist.

I'm an optimist. I'm hopeful.

I may be an optimist.