Georges St. Pierre
"People often say, 'Ah, ultimate fighting is so violent,' but it's rooted in martial arts. Martial arts incarnate respect. You can't walk into a dojo and say to your sensei, 'Hey, salut tabarnac!' After every one of my fights I go and shake the hand of my opponent. I don't need to hate the other fighter to fight him well. It's a sport." 
"A guy, a fighter is going to tell you that, ooh, he's not nervous, that he believes in himself 100%. I think he's a liar, or I think he's just not all there. Before [you] fight, you always have some little doubt about yourself, and I think that's what keeps you sharper. So yes, I was confident, but at the same time I was worried. I think that little feeling makes me sharper and makes me stronger." - UFC 65 post fight press conference.
"I am very glad you won that fight Matt, but I was not impressed by your performance and I look forward to fighting you in the near future" -To Matt Hughes at UFC 63 after Matt beat BJ Penn in the 3rd round. 
"...and now, everybody, I want you to listen to me. I'm going to go to my knees, like that, and ask the UFC, my next match, to give me a world title shot. Please! I want the belt so bad! Please give it to me!" -UFC 56 Post fight interview
"I knew I hurt him, because when I threw my first elbow... he said 'UGGH!'" -After fight with Sean Sherk at UFC 56, on breaking Sherk's nose.
"I fought Hughes the first time, he beat me fair and square- fairly squarely, sorry." -After fight with Sean Sherk at UFC 56, pleading for a rematch with Hughes.
"Today I'm doing boxing in the morning, tonight I'll do my sprints. Tomorrow it's jiu-jitsu in the morning, Olympic wrestling in the evening, and Friday it's Muay Thai and then techniques or swimming in the evening, something like that. Every day I've got a routine that enables me to diversify my training. In this sport the most important thing is to be as complete a fighter as possible." 
Personal life 
"I went to a school where it was pretty rough - I'd get my clothes stolen, my cash. And at home life was pretty hard too. I had a difficult childhood, and I'm not saying that that's why I do ultimate fighting, but it helped shape my character." 
- Interview with Isa Tousignant. UFC, PQ. Hour.ca. March 2nd, 2006.