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.
It's no wonder that America's engagement in the region has strong, sustained, bipartisan support. So I'll be handing my successor a strong foundation - including closer ties with Singapore - on which to continue building, and I'm optimistic that will happen.
You have to be optimistic about golf. I mean it's physically demanding, particularly if you're on one leg. But it's psychologically demanding regardless of your physical infirmities. I mean, it's a tough sport. You've got to be disciplined and optimistic. And if you have a bad hole, you've got to be optimistic that you'll do well on the next hole.
I am incrementally a pessimist, but I see the international debate that Edward Snowden has engendered, and I think this is exactly where the discussion should be. So, I would say I'm more optimistic than pessimistic.
This generation has a responsibility to reshape the world. Start the task even if it will not be fulfilled in your lifetime. Even if it seems hopeless now, never give up. Offer a positive vision, with enthusiasm and joy, and an optimistic outlook.
We should cultivate the optimistic temperament, and endeavour to see the good that dwells in everything. If we sit down and lament over the imperfection of our bodies and our minds, we profit nothing; it is the heroic endeavour to subdue adverse circumstances that carries our spirit upward.
I think revolution is always a little bit possible. I think it won't look or sound anything like what we would expect. But I think revolution is very difficult, and I'm not optimistic for any kind of dramatic change.
And I am an optimistic person. I guess if you want to try to find something to be pessimistic about, you can find it, no matter how hard you look, you know?
Except when you're marching to war, it's not a very optimistic thought, is it? In other words, it's the opposite of optimistic when you're thinking you're going to war.
I am in general a very pessimistic person with an optimistic, day to day take on things. The bare facts of life are utterly terrifying. And yet, one can laugh. Indeed, one has to laugh precisely because of the darkness: the nervous laughter of the trenches.