If an injury has to be done to a man it should be so severe that his vengeance need not be feared.
Never interrupt your enemy when he is making a mistake.
It's the same each time with progress. First they ignore you, then they say you're mad, then dangerous, then there's a pause and then you can't find anyone who disagrees with you.
Courage is not the absence of fear, but rather the judgment that something else is more important than fear.
These are just a couple of my favorites.