I am the greatest, I said that even before I knew I was.

It's hard to be humble, when you're as great as I am.

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.

The man who has no imagination has no wings.

I hated every minute of training, but I said, 'Don't quit. Suffer now and live the rest of your life as a champion.'