Diplomacy is the art of telling people to go to hell in such a way that they ask for directions.
Side notes:
Sir Winston Leonard Spencer Churchill was a Prime Minister of the United Kingdom, and he is best known for his wartime leadership during the Second World War. Churchill was educated at Royal Military Academy Sandhurst; he was a Nobel Prize-winning writer and historian, a prolific painter, and one of our most admired politicians. Learn more about Churchill on Wikipedia.