I don't know if the optimists or the pessimists are right. But, the optimists are going to get something done.
Better to be an optimist who gets disappointed than a pessimist who has no hope.
I'm an optimist by nature, myself, I think.
I'm a realist all the way. I'm too cynical to be an optimist. But I've lived too much of a charmed life so far to ever be a pessimist.
It is most important in creative science not to give up. If you are an optimist you will be willing to "try" more than if you are a pessimist.
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.
Pessimist: The optimist who didn't arrive.
I have always been an optimist, perhaps even too much.
Optimists are happier in life for a reason.
Being an optimist after you've got everything you want doesn't count.
If you weren’t an optimist, it would be impossible to be an architect.
An optimist is presented with a problem and sees an opportunity. A pessimist is presented with an opportunity and sees a problem.
An optimist is the person who has never had any experience at all.