I done wrestled with an alligator, I done tussled with a whale; handcuffed lightning, thrown thunder in jail; only last week, I murdered a rock, injured a stone, hospitalised a brick; I'm so mean I make medicine sick.

What's really hurting me - the name Islam is involved, and Muslim is involved and causing trouble and starting hate and violence. Islam is not a killer religion, Islam means peace. I couldn't just sit home and watch people label Muslims as the reason for this problem.
21 September 2001, in the aftermath of the World Trade Center attacks

I always bring out the best in men I fight, but Joe Frazier, I'll tell the world right now, brings out the best in me. I'm gonna tell ya, that's one helluva man, and God bless him.
Ali, after the "Thrilla in Manila"

The Butterfly and me have been through some ups and downs and there have been lots of emotions, many of them bad. But I have forgiven him. I had to. You cannot hold out for ever. There were bruises in my heart because of the words he used. I spent years dreaming about him and wanting to hurt him. But you have got to throw that stick out of the window. Do not forget that we needed each other, to produce some of the greatest fights of all time.
Frazier

I said a lot of things in the heat of the moment that I shouldn't have said. Called him names I shouldn't have called him. I apologise for that. I'm sorry. It was all meant to promote the fight.
Ali

Hey Floyd - I seen you! Someday I'm gonna whup you! Don't you forget, I am the greatest!
To then-world heavyweight champion Floyd Patterson during the 1960 Olympic Games.

Why, Chump, I bet you scare yourself to death just starin' in the mirror. You ugly bear! You ain't never fought nobody but tramps and has beens. You call yourself a world champion? You're too old and slow to be champion!
To Sonny Liston before their fight on 25 February 1964

I shook up the world! I shook up the world!
After beating Liston

That all you got George?
To Foreman late in the Rumble in the Jungle in Zaire on 30 October 1974

You've got to love a man who knows his limitations and can back them up. He was the greatest fighter of all time. Bar none.