I quite like the following bit from Fred Thompson, possible candidate for U.S president, which is the end of a speech transcribed in full here:
... as Americans, our optimism comes not from an analysis of how things are, but from our belief that we can change what we see for the better.
We have road maps at least two of them in fact the Declaration of Independence and the Constitution to guide us. How can we look at the world without thinking about inalienable rights, and doing everything necessary to protect our country? How can we think of fiscal policy or even health-care policy without remembering the limitations appropriately placed upon government and the importance of individual freedom?