I'll submit two JFK quotes, two of my favorite quotes pertaining to government:
"You will find the pressures greater than the pay. You may endure more public attacks than support. But you will have the unequaled satisfaction of knowing your character and talent are contributing to the direction and success of this free society."
"Let the public service be a proud and lively career. And let every man and woman who works in any area of our national government, in any branch, at any level, be able to say with pride and with honor in future years: "I served the United States government in that hour of our nation's need."