Winston Churchill

"If you will not fight for right when you can easily win without bloodshed; if you will not fight when your victory is sure and not too costly; you may come to the moment when you will have to fight with all the odds against you with only a precarious chance of survival. There may be a worse case. You may have to fight when there is not hope of victory at all, because it is better to perish than to live as slaves."

Rivers of Africa (1893)