When Galen Tyrol was the president of the workers’ union, he gave the famous Mario Savio “Bodies upon the gears” speech. That was pretty exciting.
I also like the short little speech Saul Tigh gives when he finds out he’s a cylon:
“My name is Saul Tigh. I am an officer in the Colonial Fleet. Whatever else I am, whatever else it means, that’s the man I want to be. And if I die today, that’s the man I’ll be.”