Far and away the best prize that life has to offer is the chance to work hard at work worth doing.
President Theodore Roosevelt, Jr, (1906 Nobel Peace Prize recipient for ending Russo-Japanese War)


Gradually, everything that happens in the world is coming to be of interest everywhere in the world, and, gradually, thoughtful men and women everywhere are sitting in judgment upon the conduct of all nations.
Secretary of State Elihu Root (1912 Nobel Peace Prize recipient for international agreements)


It is a fearful thing to lead this great peaceful people into war, into the most terrible and disastrous of all wars, civilization itself seeming to be in the balance. But the right is more precious than peace, and we shall fight for the things we have always carried closest to our hearts.
President Thomas Woodrow Wilson (1919 Nobel Peace Prize recipient for founding the League of Nations)

It isn't pollution that's harming the environment. It's the impurities in our air and water that are doing it.
Al Gore

We are ready for any unforeseen event that may or may not occur.
Al Gore

[It's] time for the human race to enter the solar system.
Al Gore

I think the last one was "taken out of context" though ;-)