In 1941 Prime Minister Winston Churchill visited Harrow, his old Public School (public schools are the equivalent of private schools in the U.S.), to raise the spirits of war weary students. At the time Britain was enduring the Blitz and had nearly succombed to the Nazi threat.
He gave some sound advice to the students. The essence of which can also be applied to situations like the current Iranian uprising:
The entire speech, only four minutes and fifteen seconds is here:
From the Churchill Audio Archive.