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Something I've realized lately, to my shock, is that I am an optimist, in that I think humans are almost infinitely capable of self-change and self-modification, and that we really can build the future that we want if we're smart about it.

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

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

I'm an optimist. I'm hopeful.

I'm a serious optimist. I come from a country where you have little to be hopeful for, and so you have to always be an optimist.

I'm an optimist by nature.

I am not an optimist. I'm a very serious possibilist. It's a new category where we take emotion apart and we just work analytically with the world.

And the funny thing is, I've always been an optimist - it's practically a congenital disorder with me.