I found this quote looking for something else and it truly moved me:
I have never been able to conceive how any rational being could propose happiness to himself from the exercise of power over others.
How wonderful it would be to have people in public life who have this attitude.
And here's something from Jefferson's First Inaugural Address:
The essential principles of our Government... form the bright constellation which has gone before us and guided our steps through an age of revolution and reformation. The wisdom of our sages and blood of our heroes have been devoted to their attainment. They should be the creed of our political faith, the text of civic instruction, the touchstone by which to try the services of those we trust; and should we wander from them in moments of error or of alarm, let us hasten to retrace our steps and to regain the road which alone leads to peace, liberty and safety.
Yes, we have wandered from those principles in moments of error and alarm and of corruption too. How greatly we need men and women of honor and integrity to lead us in retracing our steps. May we move in the right direction at least and at last on November 7.