I'm the world heavyweight champion. I consider myself a citizen of the whole world.

When I was a boxer, I wanted to be champion of the world, not the richest man in the world.

I wanted to be champ of the world, but I kept hoping something would happen to Frazier. I didn't want to fight him. Nobody wanted to fight Joe Frazier.

If you learn to sell, it's worth more than a degree. It's worth more than the heavyweight championship of the world. It's even more important than having a million dollars in the bank. Learn to sell, and you'll never starve.

Just look at the great Nelson Mandela. He came out of prison and saved his entire country. Some of the best people in the world have spent time in prison.

In 1973 I became heavyweight champion of the world with 38 victories, no defeats as a professional. You get to a point where you think you cannot lose. I felt like I had the greatest power with my fists, I was the strongest man in the world.