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.

An optimist is a person who starts a new diet on Thanksgiving Day.

I'm a technological optimist in that I do believe that technology will provide solutions that will allow the world in 2050 to support 9 billion people at an acceptable standard of living. But I'm a political pessimist in that I am concerned about whether the science will be appropriately applied.

Venture capital is an inherently optimistic form of investment - which is both its primary strength and its primary weakness.

As always, space remains an unforgiving frontier, and the skies overhead will surely present obstacles and setbacks that must be overcome. But hard challenges demand fresh approaches, and I'm optimistic that Stratolaunch will yield transformative benefits - not only for scientists and space entrepreneurs, but for all of us.

In the room, when I'm playing SpongeBob, I'm optimistic and I'm happy, and I smile in the face of those who are upset in order to make them happier. You know, there's this overwhelming optimism. And I've been lucky enough to have that become a part of my life. I like to think that it's influenced me.

I guess the news is this: If you're a Republican and you smile, liberals don't like it. Maybe that's because Democrats are afraid that I've been able to show an optimistic vision for this country.

I don't know what I would have done without believing in God. His support gives me power and energy to continue to be optimistic, to smile, not to be depressed. Sometimes, if things are not going so well, I don't cry. I say maybe it's meant to be.

I am a joyful conservative, unafraid to articulate big ideas with an optimistic smile.

I am an optimist, unrepentant and militant. After all, in order not to be a fool an optimist must know how sad a place the world can be. It is only the pessimist who finds this out anew every day.

I am essentially optimistic. Being alive is incredible. Life is extraordinary and beautiful. It can be hard and sad and terrifying, but it's all we've got.

I feel close to Lloyd in 'Say Anything'. He was like a super-interesting version of me. Only I'm not as good as him. Whatever part of me is romantic and optimistic, I reached into that to play Lloyd.

When I was a student, I studied philosophy and religion. I talked about being patient. Some people say I was too hopeful, too optimistic, but you have to be optimistic just in keeping with the philosophy of non-violence.

Our thoughts really do create our lives. They've done a lot of research showing if you're an optimistic, positive person you will be a healthier person than if you're a sad, depressed, negative person.

I am very optimistic, and I always think positive, but within reason and never getting too far ahead of the game.

I am usually positive and optimistic. If I get stressed or some results are not so good, I let it go by thinking, 'Oh well, it can be better next time.' I don't worry a lot, and I'm not too serious about anything.

I'm a big cockeyed optimist. I try to accentuate the positive as opposed to the negative.

I'm an un-healable positive optimist.

Mental discipline and tenacity in the face of obstacles are traits that have greatly helped me in both my personal and professional journey thus far. I am also very optimistic by nature and tend to focus on the positive and remain hopeful when faced with adversity.

I am blood type O-positive, which I remember by staying 'optimistic positive.'

I'm a really, really optimistic and really, really positive person. My main thing is, 'Enjoy life. Celebrate life.'

You must not under any pretense allow your mind to dwell on any thought that is not positive, constructive, optimistic, kind.

There is a sense that things, if you keep positive and optimistic about what can be done, do work out.

It's a wonderful thing to be optimistic. It keeps you healthy and it keeps you resilient.