"You'll forgive me gentelmen, if I make this a short fight. I have a train to catch!" - Sam Langford.
"Take the mouthpiece away. Don't give me no mouthpiece. I ain't gonna spit no more of this blood. I'll swallow it. I'm going to win this fight. Just let me go." - Henry Armstrong.
"I, too, am a champion." - Archie Moore to his corner and/or the referee upon their suggestion that they stop his fight with Marciano.
I always like this one from Joey Giardello about fighting Dick Tiger. . Prior to one of these latter encounters, when asked by the press if Giardello, a classic boxer, planned to trade punches with Tiger, Giardello squelched this with, "I wouldn't trade stamps with him."
"God asked me and Ray: 'who wants to be Sugar?' and I guess I didn't put my hand up fast enough." - Charley Burley.