I am the greatest, I said that even before I knew I was.
A man who views the world the same at fifty as he did at twenty has wasted thirty years of his life.
At home I am a nice guy: but I don't want the world to know. Humble people, I've found, don't get very far.
Float like a butterfly, sting like a bee.
I hated every minute of training, but I said, 'Don't quit. Suffer now and live the rest of your life as a champion.
My only fault is that I don't realize how great I really am.
It's just a job. Grass grows, birds fly, waves pound the sand. I beat people up.
Wars of nations are fought to change maps. But wars of poverty are fought to map change.
Age is whatever you think it is. You are as old as you think you are.
If you even dream of beating me you'd better wake up and apologise.
It isn't the mountains ahead to climb that wear you out; it's the pebble in your shoe.
He who is not courageous enough to take risks will accomplish nothing in life.