Filling a need is not merely good business; it's a basic attitude towards life. If you see a need, do whatever you can to meet that need.

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

I do believe he’s the greatest, but forget about boxing - give that to Joe Louis, or somebody - I believe he’s one of the greatest men I’ve ever met.

The world is full of people who want to play it safe, people who have tremendous potential but never use it. Somewhere deep inside them, they know that they could do more in life, be more, and have more -- if only they were willing to take a few risks.

Heroes have a rough time because they stand up when they ought not to, they speak when they ought not to; they always have to go that extra mile.

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

I wanted the world to know where I was from. I wanted to say to the world, "We gotcha." America gotcha.