Kakashi: I won't allow you to kill Tazuna! He's a brave man with a noble dream! The bridge he's building is the hope of this land and all its people! You're like a disease: by attacking one, you infect all! You don't care! That is not the way of the shinobi!
Zabuza: You're right, I don't care! These useless little people with their petty little dreams. Why should they matter to me? I have a dream, of my own!
Kakashi: But to have a dream, you need to have a future. You don't!