I can Quote by Marc Andreessen

I would not call myself an optimist, even though I would aspire to be. I am innately a skeptic. There's kind of an incessant…

— Carrie Brownstein

I've never been an optimist, but that's fine because pessimists have the possibility of being agreeably surprised.

— Roger Scruton

A skeptic is someone who is frustrated beyond belief.

— Chuck Palahniuk

Pessimists are usually right and optimists are usually wrong but all the great changes have been accomplished by optimists.

— Thomas Friedman

Optimists think that this is the best of all possible worlds; pessimists fear they are right.

— J. Robert Oppenheimer

It's better to be an optimist who is sometimes wrong than a pessimist who is always right

— Anonymous

Most people are optimists, although they may claim they are not. People who call themselves realists are often the biggest optimists of all.

— Stephen King

I don't know if the optimists or the pessimists are right. But, the optimists are going to get something done.

— Craig Venter

There are always going to be skeptics. Prove them wrong.

— Robert Kiyosaki

Pessimists calculate the odds. Optimists believe they can overcome them.

— Ted Koppel

Optimists are right. So are pessimists. It's up to you to choose which you will be.

— Harvey Mackay