Without discipline, no matter how good you are, you are nothing! One day, and I might not be around; you're going to meet a tough guy who takes your best shot. He'll keep coming because he's tough. Don't get discouraged. That's when the discipline comes in.

I'm not a good-looking guy. I don't care if my nose gets mashed.

When I go to Europe or South America, they laugh at things that are totally different than what Americans would laugh at. It's just so crazy how we're so different in personalities with other people.

If you did everything your mind told you to do, you do some really strange stuff. You'll probably be in jail, you'll be in trouble. But, it's all about control. We all have to control our feelings. That's the thing that separates us from animals.

I'm the most brutal and ruthless conquerer there has ever been.

Becoming a vegan gave me another opportunity to live a healthy life. I was so congested from all the drugs and bad cocaine, I could hardly breathe, [I had] high blood pressure, [was] almost dying [and had] arthritis. And once I became a vegan all that stuff diminished.

I earned that the strong will always beat the weak, but the smart will beat the strong. Boxing is a tough guy sport. But in the end, the tough guy gets to clean the streets and be a bodyguard. In the ring, the tough guy is going to get hurt; at the end of the day, he's going to talk funny. Only the smartest win. So, I know it's cliché, but power - real power - comes from knowledge, comes from smarts.