Here is another great line by Master Chief Urgayle....
Master Chief John Urgayle: Pain is your friend, your ally, it will tell you when you are seriously injured, it will keep you awake and angry, and remind you to finish the job and get the hell home. But you know the best thing about pain?
Lt. Jordan O'Neil: Don't know!
Master Chief John Urgayle: It lets you know you're not dead yet!